begin onboarding manual

README.md

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+# FRC Onboarding
+This training repository is the main focus of FRC Onboarding.

docs/intro.md

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+# Goals
+* Learn the structure of our codebase (beginning 2024 offseason)
+* Learn how to organize and collaborate unstable code
+* Learn how to use available tools to run and debug code
+
+# General Code Structure
+Notice all the different directories and files, only one is important for now
+* 'src/' contains all source code
+* 'src/main/java/frc/robot/' is where the "actual" robot code is located
+    * note the source files ('Robot.java', 'RobotContainer.java') and sub-directories ('subsystems/', 'subsystems/flywheels/')
+
+# The beginning
+'Main.java' is ostensibly the start of the program, but only contains a single line of code 'RobotBase.startRobot(Robot::new);'
+
+1. 'Main.java' calls 'Robot.java', where the important start-up code is located
+    - 'Robot::new' calls the Robot class' constructor, but 'Robot.java' lacks one(?).
+2. 'robotInit()' calls a lot of AdvantageKit logging functions. The 'RobotContainer' class contains the bulk of the robot set-up.
+'''
+@Override
+public void robotInit() {
+    ...
+    robotContainer = new RobotContainer();
+}
+'''
+3. 'robotPeriodic' is called every 20ms (50Hz) and runs a single method. This is the [Command Scheduler](https://docs.wpilib.org/en/stable/docs/software/commandbased/command-scheduler.html), a class ultimately responsible for running all logic.
+'''
+@Override
+public void robotPeriodic() {
+    CommandScheduler.getInstance().run();
+}
+'''
+
+# What is 'RobotContainer.java'?
+'RobotContainer' organizes all component code for the robot into a single class. Here