Add a doc explaining how to run the relay

relay/RUNNING-RELAY.md

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+# Steps to run the relay
+
+### 1 Check your .env you need the following set up:
+
+#### 1.1 Must have
+
+PROVER_SERVER_HOST<br>
+PROVER_SERVER_PORT<br>
+SLOTS_JUMP<br>
+
+and files with keys at:<br>
+USER_PRIVATE_KEY_FILE=/.secrets/user_private_key<br>
+INFURA_API_KEY_FILE=/.secrets/infura_api_key<br>
+
+#### 1.2 Not necessary
+
+REDIS_HOST(if not given, will use default - localhost)<br>
+REDIS_PORT(if not given, will use default - 6379)<br>
+
+#### 1.3 Good to have
+
+To run the relay you need `light_client.zkey` and `light_client.dat` files, if you dont have them we have provided <br>
+LIGHT_CLIENT_ZKEY_DOWNLOAD_LOCATION<br>
+LIGHT_CLIENT_DAT_DOWNLOAD_LOCATION
+
+#### 1.4 Network/contract setup
+
+you need at least one contract address<br>
+example:<br>
+
+LC_SEPOLIA=<i>contractAddress</i><br>
+This is the address of the light client contract(deployed on Sepolia)<br>
+
+SEPOLIA_HASHI=<i>contractAddress</i><br>
+This is the address of the hashi contract(deployed on Sepolia)<br>
+
+FOLLOW_NETWORK_SEPOLIA=chiado<br>
+This is the network whose API, our contracts above use to update themselves<br>
+
+BEACON_REST_API_CHIADO=<i>chiadoAPI</i><br>
+
+### 2 in a new terminal run `yarn redis-commander`
+
+### 3 `nix develop .#light-client`
+
+### 4 `export LODESTAR_PRESET=gnosis`(if running on Sepolia)
+
+### 5 `process-compose`
+
+If you dont get updates on chain for 15+ min -> flush the redis(redis-cli FLUSHALL) and rerun the relay(or restart pollUpdateWorker task).<br>
+
+After any changes in .env(or running direnv reload) you will need to run `nix develop .#light-client` again before starting the relay.
+
+### Prometheus ports
+
+pollUpdatesWorker - 2999<br>
+proofGenerationWorker - 3000<br>
+Sepolia - 3004<br>
+Chiado - 3010<br>
+Lukso - 3015