docs(simapp): refactored README readability and more usability (#21383)

Co-authored-by: Julien Robert <julien@rbrt.fr>

simapp/README.md

@@ -4,50 +4,119 @@ sidebar_position: 1
 
 # `SimApp`
 
-`SimApp` is an application built using the Cosmos SDK for testing and educational purposes.
+`SimApp` is a CLI application built using the Cosmos SDK for testing and educational purposes.
 
 ## Running testnets with `simd`
 
-If you want to spin up a quick testnet with your friends, you can follow these steps.
-Unless otherwise noted, every step must be done by everyone who wants to participate
-in this testnet.
-
-1. From the root directory of the Cosmos SDK repository, run `$ make build`. This will build the
-    `simd` binary inside a new `build` directory. The following instructions are run from inside
-    the `build` directory.
-2. If you've run `simd` before, you may need to reset your database before starting a new
-    testnet. You can reset your database with the following command: `$ ./simd comet unsafe-reset-all`.
-3. `$ ./simd init [moniker] --chain-id [chain-id]`. This will initialize a new working directory
-    at the default location `~/.simapp`. You need to provide a "moniker" and a "chain id". These
-    two names can be anything, but you will need to use the same "chain id" in the following steps.
-4. `$ ./simd keys add [key_name]`. This will create a new key, with a name of your choosing.
-    Save the output of this command somewhere; you'll need the address generated here later.
-5. `$ ./simd genesis add-genesis-account [key_name] [amount]`, where `key_name` is the same key name as
-    before; and `amount` is something like `10000000000000000000000000stake`.
-6. `$ ./simd genesis gentx [key_name] [amount] --chain-id [chain-id]`. This will create the genesis
-    transaction for your new chain. Here `amount` should be at least `1000000000stake`. If you
-    provide too much or too little, you will encounter an error when starting your node.
-7. Now, one person needs to create the genesis file `genesis.json` using the genesis transactions
-   from every participant, by gathering all the genesis transactions under `config/gentx` and then
-   calling `$ ./simd genesis collect-gentxs`. This will create a new `genesis.json` file that includes data
-   from all the validators (we sometimes call it the "super genesis file" to distinguish it from
-   single-validator genesis files).
-8. Once you've received the super genesis file, overwrite your original `genesis.json` file with
-    the new super `genesis.json`.
-9. Modify your `config/config.toml` (in the simapp working directory) to include the other participants as
-    persistent peers:
-
-    ```text
-    # Comma separated list of nodes to keep persistent connections to
-    persistent_peers = "[validator_address]@[ip_address]:[port],[validator_address]@[ip_address]:[port]"
-    ```
-
-    You can find `validator_address` by running `$ ./simd comet show-node-id`. The output will
-    be the hex-encoded `validator_address`. The default `port` is 26656.
-10. Now you can start your nodes: `$ ./simd start`.
+Except stated otherwise, all participants in the testnet must follow through with each step.
+
+### 1. Download and Setup
+
+Download the Cosmos SDK and unzip it. You can do this manually (via the GitHub UI) or with the git clone command.
+
+```sh
+git clone github.com/cosmos/cosmos-sdk.git
+```
+
+Next, run this command to build the `simd` binary in the `build` directory.
+
+```sh
+make build
+```
+
+Use the following command and skip all the next steps to configure your SimApp node:
+
+```sh
+make init-simapp
+```
+
+If you’ve run `simd` in the past, you may need to reset your database before starting up a new testnet. You can do that with this command:
+
+```sh
+# you need to provide the moniker and chain ID
+$ ./simd init [moniker] --chain-id [chain-id]
+```
+
+The command should initialize a new working directory at the `~simapp` location. 
+
+The `moniker` and `chain-id` can be anything but you need to use the same `chain-id` subsequently.
+
+
+### 2. Create a New Key
+
+Execute this command to create a new key.
+
+```sh
+ ./simd keys add [key_name]
+```
+
+The command will create a new key with your chosen name. 
+
+⚠️ Save the output somewhere safe; you’ll need the address later.
+
+### 3. Add Genesis Account
+
+Add a genesis account to your testnet blockchain.
+
+```sh
+$ ./simd genesis add-genesis-account [key_name] [amount]
+```
+
+Where `key_name` is the same key name as before, and the `amount` is something like `10000000000000000000000000stake`.
+
+### 4. Add the Genesis Transaction
+
+This creates the genesis transaction for your testnet chain.
+
+```sh
+$ ./simd genesis gentx [key_name] [amount] --chain-id [chain-id]
+```
+
+The amount should be at least `1000000000stake`. When you start your node, providing too much or too little may result in errors.
+
+### 5. Create the Genesis File
+
+A participant must create the genesis file `genesis.json` with every participant's transaction. 
+
+You can do this by gathering all the Genesis transactions under `config/gentx` and then executing this command.
+
+```sh
+$ ./simd genesis collect-gentxs
+```
+
+The command will create a new `genesis.json` file that includes data from all the validators. The command will create a new `genesis.json` file, including data from all the validators 
+
+Once you've received the super genesis file, overwrite your original `genesis.json` file with
+the new super `genesis.json`.
+
+Modify your `config/config.toml` (in the simapp working directory) to include the other participants as
+persistent peers:
+
+```
+# Comma-separated list of nodes to keep persistent connections to
+persistent_peers = "[validator_address]@[ip_address]:[port],[validator_address]@[ip_address]:[port]"
+```
+
+You can find `validator_address` by executing:
+
+```sh
+$ ./simd comet show-node-id
+```
+
+The output will be the hex-encoded `validator_address`. The default `port` is 26656.
+
+### 6. Start the Nodes
+
+Finally, execute this command to start your nodes.
+
+```sh
+$ ./simd start
+```
 
 Now you have a small testnet that you can use to try out changes to the Cosmos SDK or CometBFT!
 
-NOTE: Sometimes creating the network through the `collect-gentxs` will fail, and validators will start
-in a funny state (and then panic). If this happens, you can try to create and start the network first
+> ⚠️ NOTE: Sometimes, creating the network through the `collect-gents` will fail, and validators will start in a funny state (and then panic).
+> 
+
+If this happens, you can try to create and start the network first
 with a single validator and then add additional validators using a `create-validator` transaction.