doc: add README

README.md

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+# `cbctl`
+
+`cbctl` is a CLI tool for interacting with the Chainbound backend.
+
+## Installation
+With Go:
+```bash
+go get github.com/chainbound/cbctl
+```
+
+## Usage
+First, initialize `cbctl` with your API key. This will write a config file to `~/.config/cbctl/config.toml`:
+```bash
+cbctl init --key <your_api_key>
+```
+
+### Fiber Commands
+The `fiber` subcommand let's you interact with the Fiber backend.
+
+* `cbctl fiber quota`
+Gets your quota for the current billing period.
+* `cbctl fiber trace tx --hash <tx_hash>`
+Gets the trace for a transaction. Run `cbctl fiber trace tx --help` for more info.