Create README.md

Added readme.md file according to README.md template

Author: rohitjoshi6

Scripts/Miscellaneous/Streamlit_webapp/README.md

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+# Streamlit Webapp
+
+This is a python script for creating a simple compound interest calculator webapp.
+# Pre-requisites:
+
+Install the required modules:
+```bash
+pip install -r requirements.txt
+```
+# Instructions to run this script:
+
+```bash
+python Compound_interest.py
+```
+#Screenshot:
+
+![webappOP](https://user-images.githubusercontent.com/56406787/94896823-06ce4700-04ac-11eb-9d63-a4a4d24d4196.png)
+# Author:
+
+[Rohit Joshi](https://github.com/rohitjoshi6)