Updated README.md

Author: mboben

README.md

@@ -98,6 +98,15 @@ timeout = "10s"       # check for new epochs every ... seconds
 contract_address = "0xE64Df6a7e4f4c277C5299f0FE12D7BbB8A207175"    # mirror contract address
 ```
 
+### Running tests
+
+Tests for indexer expect a MySQL database running. Please run `docker-compose up` in the `indexer/resources/test` directory.
+
+Additionally, tests for voting, mirroring and uptime clients expect a Hardhat instance from <https://gitlab.com/flarenetwork/flare-smart-contracts/-/tree/staking-tests> running. You start it by running
+`yarn staking_test` (following `yarn` and `yarn c` commands).
+
+Then run `go test ./...` in the `indexer` directory.
+
 ## Attestation client services (possible future use)
 
 The following services are implemented, according to the attestation specification: