Add README.md

deposit_contract/README.md

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+# Deposit contract
+
+## How to compile the contract?
+
+Under the `eth2.0-specs` directory, execute:
+
+```sh
+make compile_deposit_contract
+```
+
+The ABI and bytecode will be updated at [`contracts/validator_registration.json`](./contracts/validator_registration.json).
+
+## How to set up the testing environment?
+
+```sh
+make install_deposit_contract_test
+```
+
+## How to run tests?
+
+```sh
+make test_deposit_contract
+```