Add Gulshan to developer directory

Author: GulshanJha00

src/users/gulshan.yaml

@@ -0,0 +1,15 @@
+name: Gulshan
+github: GulshanJha00
+website: https://gulshankumar.xyz
+email: gk4763549@gmail.com
+linkedin: https://www.linkedin.com/in/gulshankumar0/
+country: India
+location: Bangalore
+role: MERN Stack Developer
+languages: JavaScript TypeScript C++ Python
+bio: |
+  MERN stack developer focused on Next.js, backend systems, and open source.
+
+  Currently learning DevOps and improving problem solving skills through DSA and real-world projects.
+
+  Interested in scalable web applications, UI/UX, and developer tooling.