Added more comments

C/rainbow.c

@@ -1,3 +1,7 @@
+/*
+ * This file contains the source of a program used to demonstrate BTUI's 24-bit
+ * color support by printing a rapidfire rainbow.
+ */
 #include <stdio.h>
 #include <math.h>
 #include "btui.h"

C/test.c

@@ -1,3 +1,7 @@
+/*
+ * This file contains a basic example of BTUI C API usage.
+ */
+
 #include <stdio.h>
 #include "btui.h"
 

Lua/test.lua

@@ -1,3 +1,7 @@
+#!/usr/bin/env lua
+--
+-- This file contains a basic example of BTUI Lua usage.
+--
 local btui = require("btui")
 
 btui(function(bt)

Python/test.py

@@ -1,3 +1,8 @@
+#!/usr/bin/env python3
+#
+# This file contains a simple test program for demonstrating some basic Python
+# BTUI usage.
+#
 from btui import open_btui
 
 with open_btui() as bt: