Made Readme

README.md

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+# Kestrel focusing script
+
+## Requirements
+make sure to install python 3.9.7 or better
+Install requirements with
+```pthon
+python3 -m pip install -r requirements.txt
+```
+It could also be just python depending on system naming conventions
+```pthon
+python -m pip install -r requirements.txt
+```
+
+## Description
+The script will pull from the video device described by 
+```python
+cap = cv2.VideoCapture(1)
+```
+where the number is the video device iterated by the operating system. If you have only one device it will be populated on "0". If you have two, than the second would be populated on "1". Change this according to your setup. 
+