add readme

README.md

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+## To run automatic staking
+
+1. Clone this repository to a directory on your machine
+
+        git clone https://gitea.dgov.io/DGF/dgf-prototype
+
+1. Change to the `ethereum` directory
+
+        cd ethereum
+
+1. Install the project using `npm`
+
+        npm install
+
+1. Copy the example configuration file
+
+        cp .env.example .env
+
+1. Export your Sepolia private key from MetaMask and add it to your `.env` file
+
+        SEPOLIA_API_KEY="YOURKEY"
+
+1. Run the automatic staking script
+
+        npm run automatic-staking-sepolia