Add instructions

Signed-off-by: Tushar Goel <[email protected]>

Author: TG1999

README.md

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+back2source-data
+================
+
+Checking if package sources and binaries match
+
+Instructions to run:
+====================
+
+1. Clone the repository using git clone  https://github.com/aboutcode-org/back2source-data
+
+2. Install beautifulsoup4 using pip install beautifulsoup4
+
+3. Run the script using python3 etc/scripts/get_fedora_urls.py
+
+4. It will generate a file named pairs.csv
+
+5. Install purldb https://github.com/nexB/purldb
+
+6. Setup purldb using purldb Instructions
+
+7. activate venv and run etc/scripts/run_d2d.py
+
+8. It will generate a file named d2d-summary.csv