Add Band Land guide

Signed-off-by: Fifo F <fifo@fifo-f.eu>

2-band-land/3-gong-heights.md

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+# Band Land
+
+## Gong Heights
+
+### Stage 1
+
+- Rayman must get on the bongos of the first monk, then jump on the cloud above. The first cage will appear on the left.
+
+- After getting on the drums of the fifth monk, you must helicopter to the left. The second cage will be in plain sight.
+
+- When you come to an area with a lot of Tings and bouncing clouds, descend to a cloud below, where you’ll see the third cage.
+
+- After you pass the first monk with crystal balls, reach the recorder platform and the fourth cage will drop down from the sky.
+
+### Stage 2
+
+- As you proceed to the right in this stage, there will be an invisible force. You must move quickly; otherwise, the force will cause instant death. The fifth cage can be found after the first trail of Tings. 
+
+- The sixth cage is at the bottom of a slope, after you jump over the final green wrong note in this area.