Add very initial version of smart contracts with tests

truffle-config.js

@@ -0,0 +1,23 @@
+/*
+ * NB: since truffle-hdwallet-provider 0.0.5 you must wrap HDWallet providers in a 
+ * function when declaring them. Failure to do so will cause commands to hang. ex:
+ * ```
+ * mainnet: {
+ *     provider: function() { 
+ *       return new HDWalletProvider(mnemonic, 'https://mainnet.infura.io/<infura-key>') 
+ *     },
+ *     network_id: '1',
+ *     gas: 4500000,
+ *     gasPrice: 10000000000,
+ *   },
+ */
+
+module.exports = {
+  // See <http://truffleframework.com/docs/advanced/configuration>
+  // to customize your Truffle configuration!
+  compilers: {
+    solc: {
+      version: "0.6.0"
+    }
+  }
+};