Setup Jest (#57)

- Setup Jest
- Add test scripts
- Configure Drone

Fixes #1

Co-authored-by: Ethan Lane <ethan@vylpes.com>
Reviewed-on: https://gitea.vylpes.xyz/RabbitLabs/random-bunny/pulls/57

.eslintrc

@@ -44,6 +44,7 @@
         "module": "writable",
         "require": "writable",
         "process": "writable",
-        "console": "writable"
+        "console": "writable",
+        "jest": "writable"
     }
 }