add links to geekhack thread

CONTRIBUTING.md

@@ -52,7 +52,7 @@ A healthy project needs the perspective of many people.
 * Documentation - Suggest a clarification, simplification, correction, or other improvement.
 We need the perspective of people new to the project to see these things.
 Sometimes just changing a word or two makes a big difference.
-* [Current user contributions](todo geekhack) highlights contributions that are needed for the keybrd project's current stage of development.
+* [Current user contributions](https://geekhack.org/index.php?topic=83599.0) highlights contributions that are needed for the keybrd project's current stage of development.
 
 Text file documentation style guide:
 * Use Markdown with a .md suffix.

README.md

@@ -55,4 +55,4 @@ Support
 keybrd tutorial_1 shows how to build a breadboard keyboard.
 The remaining [keybrd tutorials](tutorials) show how to create custom keybrd firmware.
 
-Please ask questions in [keybrd firmware library](geekhack todo) thread if something is not clear.
+Please ask questions in [keybrd firmware library](https://geekhack.org/index.php?topic=83599.0) thread if something is not clear.