added a read me for converter

CoreMLConverter_ReadMe.md

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+# Steps to run this
+
+1) Create a virtual enviornment
+2) Activate the enviorment
+3) pip install -r requirements.txt
+4) run save_model.py, After running it under checkpoints folder **ppe_yolov4-tiny-608-24thAug** should be generated.
+    <br>This is the keras checkpoint which we'll use in out jupyter notebook
+5) After running the save model launch **PortExistingModelToCoreML.ipynb** . After running the final cell of jupyter
+   <br>Predictions should be visible
+<br>![](/Users/ankit/Documents/code/iOS/learn/CoreMLConverterCompletePipeline/screenshots/Screenshot 2022-08-24 at 7.23.04 PM.png)
+
+