Add some helpful info for contributors

CONTRIBUTING.md

@@ -0,0 +1,46 @@
+# Adding functions
+To add new functions to HACKRWATCH, follow these steps
+
+1. Assign a sequential number to the switcher, comment this on the switcher comment around line 41
+
+2. Add 2 methods, a loop and a setup. This follows the same execution style of how Arduino does setup() and loop(). Use comments to seperate the methods(Eventually this should be seperated into files)
+
+3. Add your methods to the case statements at the bottom of the code
+
+# Add to a menu
+
+For this example we will add a new app to the main menu
+
+Locate the main menu comment, and find the `mmenu[]`
+
+Add your entry to the array, along with the switch code you added to the switcher. 
+
+# Lock the switcher to utilize the side button
+
+Set `rstOverride` to true. 
+
+# Switch to another app
+
+Paste the following code to switch 
+
+```
+isSwitching = true;
+current_proc = <SWITCHER NUMBER>;
+```
+
+On the next loop, the setup method for the other app will be called.
+
+# Important code when switching
+
+When you want to switch, generally you should clear the LCD and set the rotation to the direction your app needs
+
+For example, this is the clock setup:
+```
+void clock_setup() {
+  M5.Lcd.setRotation(rotation);
+  M5.Lcd.fillScreen(BLACK);
+  M5.Lcd.setTextSize(1);
+}
+```
+
+Note the setRoation call, rotation is going to be your landscape rotation set in the EEPROM. If you want to use portrait, use **0**.