Create README.md in default template (#5465)

* Create README.md in default template

* Add suggested changes to README.md

`Foundry` intro section is expanded the same as ReadMe in the Foundry repo. 
`forge create` is changed to `forge script`

* chore: write readme to template

---------

Co-authored-by: Enrique Ortiz <hi@enriqueortiz.dev>

cli/assets/README.md

@@ -0,0 +1,66 @@
+## Foundry
+
+**Foundry is a blazing fast, portable and modular toolkit for Ethereum application development written in Rust.**
+
+Foundry consists of:
+
+-   **Forge**: Ethereum testing framework (like Truffle, Hardhat and DappTools).
+-   **Cast**: Swiss army knife for interacting with EVM smart contracts, sending transactions and getting chain data.
+-   **Anvil**: Local Ethereum node, akin to Ganache, Hardhat Network.
+-   **Chisel**: Fast, utilitarian, and verbose solidity REPL.
+
+## Documentation
+
+https://book.getfoundry.sh/
+
+## Usage
+
+### Build
+
+```shell
+$ forge build
+```
+
+### Test
+
+```shell
+$ forge test
+```
+
+### Format
+
+```shell
+$ forge fmt
+```
+
+### Gas Snapshots
+
+```shell
+$ forge snapshot
+```
+
+### Anvil
+
+```shell
+$ anvil
+```
+
+### Deploy
+
+```shell
+$ forge script script/Counter.s.sol:CounterScript --rpc-url <your_rpc_url> --private-key <your_private_key>
+```
+
+### Cast
+
+```shell
+$ cast <subcommand>
+```
+
+### Help
+
+```shell
+$ forge --help
+$ anvil --help
+$ cast --help
+```

cli/src/cmd/forge/init.rs

@@ -113,6 +113,9 @@ impl Cmd for InitArgs {
             // write the script
             let contract_path = script.join("Counter.s.sol");
             fs::write(contract_path, include_str!("../../../assets/CounterTemplate.s.sol"))?;
+            // Write the default README file
+            let readme_path = root.join("README.md");
+            fs::write(readme_path, include_str!("../../../assets/README.md"))?;
 
             // write foundry.toml, if it doesn't exist already
             let dest = root.join(Config::FILE_NAME);