Update README.md

Author: fsiddh

3. Core Subjects/README.md

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-# Core Subjects (OS, DBMS, OOPs, System Design, CN) 
-All the study material and the assignments which I made/ got and did respectively for Core subjects will be uploaded here.
+# Core Subjects
+
+<img src="https://www.pepcoding.com/images/logo.png" alt="Smiley face" height="300" width="300">
+
+![IBM](http://i.imgur.com/Qktqnu1.png) INSTRUCTORS
+#### Instructors: ?
+
+## Course Description
+
+All the study material and the assignments which I made/ got and did respectively for Core Subjects will be uploaded here.
+
+*This course is part of the 'Pepcoding Placement Program'.
+