OPENCAMERA app - add feature.

i need to Use the "Opencamera" open source app and add 2 buttons on the preview screen: a) First button - click: rotate the preview screen (of the back camera - not the selfy) 180 degrees horizontal, another click: return back b) Secound button - click: flip(mirror) the preview screen (of the back camera - not the selfy) 180 degrees vertical, another click: return back 2. The finale result should make the preview screen seen in 4 possibilities: a) Preview screen normal. b) Preview screen rotate 180 degrees horizontal c) Preview screen flip(mirror) 180 degrees vertical d) Preview screen rotate 180 degrees horizontal + flip(mirror) 180 degrees vertical 3. The 2 buttons (rotate/flip(mirror)) should be placed on the preview screen by the side of the zoom +/- buttons 4. With the delivery of this task you will provide the OpenCamera source files. 5. All support of howto is given it this open source site: [login to view URL] 6. delivery of this task - 4 days + 4 revisions. 7. Attach is a pdf with images of how it expected to be. 8. should work with Android phone A11 and up.