CONTRIBUTING.md in tiddle-1.7.1 vs CONTRIBUTING.md in tiddle-1.8.0

@@ -7,5 +7,27 @@
   BUNDLE_GEMFILE=gemfiles/<PICK YOUR FAVOURITE>.gemfile rake
   ```
 3. Introduce your change. If it's a new feature then write a test for it as well.
 4. Make sure that tests are passing.
 5. Push to your fork and submit a pull request.
+
+#### Docker for development
+
+Alternatively you can use Docker for the development setup. This requires Docker
+and Docker Compose installed.
+
+```
+make build
+make bundle
+```
+
+And in order to run the tests and linter checks:
+
+```
+make test
+```
+
+After you're done, cleanup leftover containers:
+
+```
+make cleanup
+```