✏️ Add contract verification to docs (#23)

Author: p-sad

docs/source/getting-started.rst

@@ -20,3 +20,12 @@ or if you prefer you can use npm:
 .. code-block::
 
    npm install --save-dev ethereum-mars
+
+In order to generate an artifacts file that Mars will use when deploying, run:
+
+.. code-block::
+
+   npx mars
+
+It is advisable to add the above command at the end your build script so it
+gets executed every time you build a new version of your contracts.

docs/source/verifying-contracts.rst

@@ -0,0 +1,19 @@
+Verifying smart contracts
+=========================
+
+Currently, you can automate contract verification on Etherscan
+if you are using Waffle to build your contracts.
+
+In order to verify your contracts, use your deployment script
+with the following command line parameters:
+
+.. code-block:: bash
+
+   yarn ts-node deployment.ts --verify --etherscan-key <ETHERSCAN_API_KEY>
+
+In order for this to work, the :code:`compilerOptions` in your
+:code:`waffle.json` config file must be stated explicitly, as
+Waffle's default compiler options are different from Etherscan's.
+
+The :code:`compilerVersion` setting also needs to be set to
+one of the `compiler versions supported by Etherscan <https://etherscan.io/solcversions>`_.