add PostgreSQL README

WMRamadan · WMRamadan · commit 4c393b3126c8 · 2024-06-27T01:07:20.000+03:00
diff --git a/postgresql/README.md b/postgresql/README.md
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+# PostgreSQL
+
+PostgreSQL is a free and open-source relational database.
+
+More info [here](https://www.postgresql.org/)
