Updated 4. Final assembly (markdown)

4.-Final-assembly.md

@@ -1 +1,14 @@
-placeholder
+** TODO PIX completed mouse**
+
+## Step 1: Get the necessary tools
+**TODO PIX**
+- 2.5mm Allen key or screwdriver
+
+## Step : Verify that the Ploopy Mouse is working correctly
+Plug the electronics assembly into your computer. The buttons should be clicking, and if you hover your finger over the sensor, it should move the cursor.
+
+## Step : All done!
+**TODO PIX completed enclosure halves**
+Congrats, you finished building the Ploopy Mouse!
+
+It's done! Plug it in, use it, but don't you dare abuse it!