docs: Updated README with trace endpoints & requirements note

README.md

@@ -49,7 +49,8 @@ NOTE: Node LTS (`long term support`) versions start with an even number, and odd
 - [Available endpoints](https://paritytech.github.io/substrate-api-sidecar/dist/)
 - [Chain integration guide](./guides/CHAIN_INTEGRATION.md)
 - [Docker](#docker)
-- [Note for maintainers](#note-for-maintainers)
+- [Notes for maintainers](#notes-for-maintainers)
+- [Hardware requirements](#hardware-requirements)
 
 ## NPM package installation and usage
 
@@ -93,6 +94,18 @@ node_modules/.bin/substrate-api-sidecar
 
 [Click here for full endpoint docs.](https://paritytech.github.io/substrate-api-sidecar/dist/)
 
+In the full endpoints doc, you will also find the following `trace` related endpoints : 
+- /experimental/blocks/{blockId}/traces/operations?actions=false
+- /experimental/blocks/head/traces/operations?actions=false
+- /experimental/blocks/{blockId}/traces
+- /experimental/blocks/head/traces
+
+To have access to these endpoints you need to :
+1. Run your node with the flag `—unsafe-rpc-external`
+2. Check in sidecar if `BlocksTrace` controller is active for the chain you are running.
+
+Currently `BlocksTrace` controller is active in [Polkadot](https://github.com/paritytech/substrate-api-sidecar/blob/ff0cef5eaeeef74f9a931a0355d83fc5ebdea645/src/chains-config/polkadotControllers.ts#L17) and [Kusama](https://github.com/paritytech/substrate-api-sidecar/blob/ff0cef5eaeeef74f9a931a0355d83fc5ebdea645/src/chains-config/kusamaControllers.ts#L17).
+
 ## Source code installation and usage
 
 ### Quick install
@@ -373,3 +386,7 @@ NOTE: You must be a member of the `@substrate` NPM org and must belong to the `D
 #### Publish Calc Package
 
 1. `cd` into `calc/pkg` and `npm login`, then `npm publish`.
+
+## Hardware requirements
+
+Sidecar is a stateless program and thus has no specific hardware requirements to run (disk space, memory, etc.).