developer_guide.md in quickery-0.1.1 vs developer_guide.md in quickery-0.1.2

@@ -13,9 +13,18 @@
 * Test suite makes use of the following gems worth mentioning (in addition to some others):
   * [rspec-rails](https://github.com/rspec/rspec-rails)
   * [combustion](https://github.com/pat/combustion)
   * [appraisal](https://github.com/thoughtbot/appraisal)
 
+### Setup
+
+```bash
+# setup development gems
+bundle install
+# setup Apprisal for testing different Rails versions below
+bundle exec appraisal install
+```
+
 ```bash
 # to auto-test specs whenever a spec file has been modified:
 bundle exec guard
 
 # to manually run specs for a particular rails version (for more info: see Appraisals file):