Add .env example

.env.example

+SIGNING_KEY=
+RPC_URL=http://127.0.0.1:8545
+
+CHAIN_ID=636363
+
+AUTO_SEND_PERIOD=30
\ No newline at end of file

README.md

@@ -6,6 +6,10 @@ A simple HTTP API to inject transactions or behaviors in an EcoMobiCoin test net
 
 This project heavily use the forked and adapted [ethers-rs](https://gitlab.limos.fr/ecomobicoin/ethers-rs).
 
+## Env vars
+
+Copy the env example file to `.env` with the following command: `cp .env.example .env`
+
 ## Development
 
 ### Auto-Reloading Development Server