adding feedback

feedback.md

+# Hospital Feedback. Intubation boxes: 
+
+Delivered [this mockup](https://gitlab.cba.mit.edu/zfredin/intubation-station) to the hospital, the feedback we received is: 
+
+  - Sharp edges must be avoided. There is high chances to get cut by them or cut your glove. 
+  - Need to be all transparent. 
+  - If possible, easy assembly less than 20 seconds
+  - Gaps generated by the frame and PETG are worrying
+
+Go back to the main page [here](README.md)
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