Add coding-tutor plugin to marketplace (#61)

Personalized coding tutorials that build on your existing knowledge
and use your actual codebase for examples. Includes spaced repetition
quizzes to reinforce learning.

- 3 commands: /teach-me, /quiz-me, /sync-tutorials
- 1 skill: coding-tutor

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

plugins/coding-tutor/.claude-plugin/plugin.json

@@ -0,0 +1,9 @@
+{
+  "name": "coding-tutor",
+  "version": "1.2.1",
+  "description": "Personalized coding tutorials that use your actual codebase for examples with spaced repetition quizzes",
+  "author": {
+    "name": "Nityesh Agarwal"
+  },
+  "keywords": ["coding", "programming", "tutorial", "learning", "spaced-repetition"]
+}