docs(devins): add documentation for development environment setup

This commit adds a new documentation file for setting up the development environment, providing guidance on how to organize different types of tasks using the JetBrains Academy plugin as a reference.

Author: phodal

docs/devins/development.md

@@ -0,0 +1,11 @@
+---
+layout: default
+title: Development DevIns
+nav_order: 99
+parent: AI Agent Language
+---
+
+[JetBrains Academy plugin](https://github.com/JetBrains/educational-plugin) show a very good sample on how to organize 
+different types of tasks in a single plugin.
+
+- check: `EduTaskCheckerBase.kt` for task running