ADD index for developers' information

docs/developers/index.md

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+# FoxMesh Developer Documentation
+
+Welcome to the **FoxMesh** contributor infrastructure. This section contains all guide rails required to successfully build, test, and expand the asynchronous LoRa tracking firmware.
+
+## Getting Started
+
+Please follow these onboarding layers in chronological order:
+
+1. **[Development Environment Setup](installation-vscodium.md)**  
+   Step-by-step validation guide for setting up PlatformIO inside privacy-focused VSCodium architectures.
+2. **[Project Instantiation](project-creation.md)**  
+   How to correctly structure and initialize a clean ESP-IDF targeting profile for our hardwired nodes.
+3. **[Coding Standards & Architecture](coding-standards.md)**  
+   Our strict C++ guidelines regarding thread-safety, FreeRTOS tasks, and memory narrowing constraints.
+4. **[Troubleshooting Guide](troubleshooting.md)**  
+   Solutions for Python path collisions and SCons linking errors inside external terminal shells.