Start of testing checklist (#284)

* Start of testing checklist

* Addressing review comments

Author: alan412

docs/testing_before_pr_checklist.md

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+For each PR, make sure each of these works
+
+# New items
+* [ ] Make a new project and make sure you can edit in Robot and TeleOp
+* [ ] Add an opmode "Auto" from the + next to Tabs
+* [ ] Add a mechanism "Arm" from the + next to Tabs
+# Using robot
+* [ ] Add a component to the Robot
+* [ ] Add a mechanism to the Robot
+* [ ] When editing an OpMode, make sure the component shows up in the toolbox Robot -> Components ->
+* [ ] When editing an OpMode, make sure the mechanism shows up in the toolbox Robot -> Mechanisms -> my_arm
+# Events
+* [ ] Add an event to the Mechanism
+* [ ] In Robot, make sure you can see the event handler in the toolbox Robot -> Mechanisms -> my_arm -> Events
+* [ ] In Opmode, make sure you can see the event handler in the toolbox Robot -> Mechanisms -> my_arm -> Events
+# Mechanims
+* [ ] Add a public component to the mechanism
+* [ ] Add a private component to the mechanism
+* [ ] Make sure that in the Robot you can see the public component (and not the private one) in the toolbox
+# Code Generation
+* [ ] Generate code (right now "Deploy") and make sure there are no errors in the console
+* [ ] Check that the deploy zip file contains robot.py, teleop.py, auto.py, and arm.py.