Add a sample script to print all colors

doc/colors.py

@@ -0,0 +1,9 @@
+"""
+Print every color code supported by colorlog in it's own color.
+"""
+
+from colorlog import escape_codes
+
+if __name__ == "__main__":
+    for key, value in escape_codes.items():
+        print(value, key, escape_codes["reset"])