Update README.md

add topic vise summery databases

README.md

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-# SQL-DATABASES
-Social Media DATABASE in SQL Sever 
+# Social Media DATABASE in SQL Sever 
+
+  -:Here's a simple SQL schema for each database:-
+
+Facebook_db:- A database for storing Facebook user data, including profiles, posts, comments, and other social media interactions.
+
+Instagram_db:- A database for storing Instagram user data, includingprofiles, posts, comments, hashtags, and other social media interactions.
+
+Meta_AI_db:- A database for storing AI model data, including training data, model parameters, and other AI-related data.
+
+PUBG_db:- A database for storing PUBG game data, including player profiles, game statistics, and other game-related data.
+
+Twitter_db:- A database for storing Twitter user data, including profiles, tweets, comments, hashtags, and other social media interactions.
+
+WhatsApp_db:- A database for storing WhatsApp user data, including profiles, messages, and other messaging interactions.
+
+Youtube_db:- A database for storing YouTube video data, including channel profiles, videos, comments, and other video-related interactions.
+