Create CONTRIBUTING.md

This is a rough draft; it should be updated in the future as concerns arise.

CONTRIBUTING.md

@@ -0,0 +1,40 @@
+# Style guidelines
+Because DobieStation is so new, it's important to enforce style guidelines to ensure that the code remains consistent in the distant future.
+
+## General
+If nothing else, follow the style of the file(s) you're modifying.
+
+* Use ```/**comments**/``` for file-wide documentation, ```/*comments*/``` for multi-line comments, and ```//comments``` for everything else.
+* Functions, local variables, class/struct members: ```snake_case```
+* Classes and structs: ```PascalCase```
+  * Exception: PS2-register structs are ```UPPER_SNAKE_CASE```
+
+## Example
+```
+/**
+Here's some nice documentation for the file.
+The GS takes data from the VU1, VIF, and EE and makes a lot of graphics with it.
+**/
+
+/* 
+The ChewToy struct is responsible for playing a chewing sound.
+make_sound works through deep magic. Do not modify!
+*/
+struct ChewToy
+{
+    void make_sound();
+};
+
+//This is a super important I/O register for the Graphics Synthesizer, so the name is in UPPER_SNAKE_CASE.
+struct IMPORTANT_GS_REG
+{
+    bool flag1, flag2;
+};
+
+//This function prints a bark to the console.
+void good_boy()
+{
+    const char* bark_sound = "Bark!";
+    printf("%s\n", bark_sound);
+}
+```