Add CONTRIBUTING guide for developers

Author: dheeraj12347

CONTRIBUTING.md

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+# Contributing to iceberg-cpp
+
+This document describes how to set up a development environment, run tests, and use existing tooling such as Docker and pre-commit for iceberg-cpp. [][]
+
+## Development environment
+
+The project can be built and developed using the existing Docker-based environment. Please refer to the README and Doxygen documentation for more detailed API and usage information. [][][]
+
+### Local prerequisites
+
+- Git
+- CMake and a C++17-compatible compiler
+- Python (for pre-commit)
+- Docker (recommended for a consistent dev environment) [][]
+
+## Building and testing
+
+Typical steps (refer to README for exact commands and options): [][]
+
+```bash
+mkdir build
+cd build
+cmake ..
+make -j$(nproc)
+ctest