test: add naive contract tests

packages/concordia-contracts/test/TestForum.sol

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+pragma solidity >=0.4.21 <0.7.0;
+
+import "truffle/Assert.sol";
+import "../contracts/Forum.sol";
+
+contract TestForum {
+    function testTrue() public {
+
+        Assert.isTrue(true, "Oops placeholder test failed!");
+    }
+}

packages/concordia-contracts/test/forum.js

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+const Forum = artifacts.require('Forum');
+
+contract('Forum', (accounts) => {
+  it('...should succeed.', async () => {
+    const forumInstance = await Forum.deployed();
+
+    assert
+      .ok(forumInstance
+        .signUp('testUsername', { from: accounts[0] }), 'The user was not created.');
+  });
+});