Added readme.md for backend/seleniumScript

The readme explains how to run the selenium scripts.

Author: AK04

Diff for: backend/seleniumScript/readme.md

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+# Instructions to run the scripts
+
+ ### 1. Install selenium on your PC
+
+```
+$ pip install selenium
+```
+> Make sure it installs selenium for python 3 rather than python 2
+
+### 2. Install geckodriver
+
+```
+$ wget https://github.com/mozilla/geckodriver/releases/download/v0.18.0/geckodriver-v0.18.0-linux64.tar.gz
+$ tar -xvzf geckodriver*
+$ export PATH=$PATH:/path-to-extracted-file/geckodriver
+```
+> path-to-extracted-file must be filled in manually
+
+Gecko Driver is needed to run the firefox browser using selenium
+
+### 3. Test selenium
+
+caltest.py checks how long it takes to return the calorie value of a food item(by default it checks coffee) and
+stores the calorie value in a json file.
+
+```
+python3 caltest.py
+```
+
+### 4. Scrapping the webpage
+
+foodcal.py scraps the whole webpage and returns the calorie value of all food item and then stores it in a json file
+
+```
+python3 foodcal.py
+```
+> This program will stop working in-between because the webpage is poorly written and hence making it difficult for the program to get information properly.