Update docs with more detailed API versioning (#1346)

Author: wojciechos

README.md

@@ -155,7 +155,7 @@ After following these steps, Juno should be up and running on your machine, util
 ## ✔ Supported Features
 
 - Starknet [v0.12.2](https://docs.starknet.io/documentation/starknet_versions/version_notes/) support.
-- JSON-RPC [v0.5.0](https://github.com/starkware-libs/starknet-specs/releases/tag/v0.5.0):
+- JSON-RPC [v0.5.0](https://github.com/starkware-libs/starknet-specs/releases/tag/v0.5.0)(Available under `/v0_5` endpoint)
   - `starknet_chainId`
   - `starknet_blockNumber`
   - `starknet_blockHashAndNumber`

docs/versioned_docs/version-0.7.0/intro.md

@@ -30,6 +30,17 @@ For a complete list of options and their explanations, see the [Example Configur
 docker run nethermind/juno --help
 ```
 
+# Juno is compatible with the following Starknet API versions:
+
+- **v0.5.0** (Endpoint: `/v0_5`)
+- **v0.4.0** (Endpoint: `/v0_4`)
+
+To interact with a specific API version, you can specify the version endpoint in your RPC calls. For example:
+
+```shell
+curl -X POST http://localhost:6060/v0_5 -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"juno_version","id":1}'
+```
+
 # Looking for a Starknet RPC Provider? 
 
 If you are looking for a Starknet RPC provider, Nethermind will offer a Starknet RPC service before the upcoming feeder gateway deprecation. You can register your interest on [this Google Form](https://docs.google.com/forms/d/e/1FAIpQLSf2Bl4fc9-38E-fpWf0tnMWc3jSeOFkpjSPMN_j1en1WmEgKg/viewform?usp=sf_link).