[docs] Add some extra docs regarding PTX support

Author: Breakthrough

docs/cuda-compatibility.md

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+# CUDA Compatibility Reference
+
+## CUDA Toolkit vs Compute Capability Support
+
+| CUDA Version | Min Compute | Max Compute | Notes |
+|--------------|-------------|-------------|-------|
+| 13.x | 7.5 | 12.0+ | Drops Maxwell, Pascal, Volta |
+| 12.x | 5.0 | 10.0+ | Current LTS, drops Kepler |
+| 11.x | 3.5 | 8.6+ | Legacy, includes Kepler |
+
+## GPU Architectures
+
+| Compute Capability | Architecture | Example GPUs | Released |
+|--------------------|--------------|--------------|----------|
+| 10.0 | Blackwell | RTX 50 series | 2025 |
+| 9.0 | Hopper | H100, H200 | 2022 |
+| 8.9 | Ada Lovelace | RTX 40 series | 2022 |
+| 8.6 | Ampere (consumer) | RTX 30 series | 2020 |
+| 8.0 | Ampere (datacenter) | A100, A30 | 2020 |
+| 7.5 | Turing | RTX 20 series, GTX 16 series | 2018 |
+| 7.0 | Volta | V100, Titan V | 2017 |
+| 6.1 | Pascal (consumer) | GTX 10 series | 2016 |
+| 6.0 | Pascal (datacenter) | P100 | 2016 |
+| 5.2 | Maxwell v2 | GTX 900 series, Titan X | 2014 |
+| 5.0 | Maxwell v1 | GTX 750 Ti | 2014 |
+| 3.5 | Kepler | GTX 600/700 series | 2012 |
+
+## SASS vs PTX
+
+- **SASS** (Shader Assembly): Native GPU code, runs directly on matching architecture
+- **PTX** (Parallel Thread Execution): Intermediate code, JIT-compiled at runtime
+
+PTX is forward-compatible only (e.g. PTX 10.0 works on GPUs ≥10.0, not older). SASS is required for older GPUs that are lower than the PTX version. A GPU needs either matching SASS or older PTX which it can JIT compile.
+
+
+
+## References
+
+- [CUDA Toolkit Archive](https://developer.nvidia.com/cuda-toolkit-archive)
+- [CUDA GPUs - Compute Capability](https://developer.nvidia.com/cuda-gpus)
+- [CuDNN Archive](https://developer.nvidia.com/cudnn-archive)
+- [Video Codec SDK](https://developer.nvidia.com/video-codec-sdk)