Add docs for the comp-mode usb sticks

scripts/comp_usb_test.py

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+#!/usr/bin/env python
+
+import argparse
+import json
+import subprocess
+
+parser = argparse.ArgumentParser()
+parser.add_argument('mount_point', metavar='MOUNT_POINT')
+args = parser.parse_args()
+
+with open("{}/mode.json".format(args.mount_point)) as f:
+    data = json.load(f)
+    print(data)
+
+    if data["zone"] not in range(4):
+         exit("invalid zone")
+    if data["arena"] != "B":
+        exit("invalid arena")
+
+print("Pass")
+
+subprocess.check_call(['umount', args.mount_point])

src/comp-mode-usb-sticks.md

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+# Competition Mode USB stick check
+
+## Equipment
+
+ * Internet access, or a copy of make-zip locally
+ * Laptop
+ * ODROID
+ * ODROID Power cable
+ * Power Board
+ * Battery
+ * USB stick
+ * Competition mode usb sticks
+ * USB hub
+ * USB A-B cable
+ * USB micro cable
+ * a power board power loop, or:
+  * wire
+  * 7mm CamCon
+  * Wire cutters
+
+## Procedure
+
+*Setup time*: 5 minutes
+
+1. Make a power loop for the power board
+1. Assemble the minimal kit into a kit
+1. Put a robot.zip onto the USB stick with the following code in:
+``` python
+import time
+from pprint import pprint
+from sr.robot import Robot
+
+R = Robot()
+
+pprint({
+    'zone': R.zone,
+    'mode': R.mode,
+})
+
+if R.mode != 'comp':
+    # error that we're not in comp mode
+    R.power.beep(500, note='a')
+    exit("not comp mode")
+
+for _ in range(R.zone + 1):
+    R.power.beep(200, note='d')
+    time.sleep(0.4)
+```
+1. Run that code, so you know what the error sounds like
+
+*Execution time*: 20 seconds per USB stick.
+
+ 1. Plug in a comp-mode stick to test
+ 1. Run `./scripts/comp_usb_test.py /path/to/mount/point`.
+ 1. Check that it prints the arena and zone the same as the physical label for
+    the USB stick
+ 1. Check that it prints a success message
+    (if successful the script will unmount the stick, so it can be removed
+    immediately)
+
+Also, to check that the sticks work in kit; for an example of each arena/corner:
+ 1. Plug the comp-mode stick into the kit
+ 1. Boot the kit, after the start button is pressed it should beep for one more
+    time than the number of the corner, i.e: corner 2 should beep three times