Readme: Clarify latest build/contribution info; Adjust Technical Notes header type for consistency

README.md

@@ -40,7 +40,7 @@ _Note1: Recommended Single Thread Performance is based on moderately complex gam
 
 _Note2: Recommended GPU is based on 3x Internal, ~1080p resolution requirements. Higher resolutions will require stronger cards; 6x Internal, ~4K resolution will require a [PassMark G3D Mark](https://www.videocardbenchmark.net/high_end_gpus.html) rating around 12000 (GeForce RTX 2060 Radeon RX 6600 Intel Arc A750). Just like CPU requirements, this is also highly game dependent. A quick reference for GPU **intensive games**: [Wiki](https://wiki.pcsx2.net/Category:GPU_intensive_games)_   
 
-### Technical Notes
+## Technical Notes
 
 -   You need the [Visual C++ 2019 x64 Redistributables](https://support.microsoft.com/en-us/help/2977003/) to run PCSX2 on Windows.
 -   Windows XP and Direct3D9 support was dropped after stable release 1.4.0.
@@ -52,4 +52,9 @@ _Note2: Recommended GPU is based on 3x Internal, ~1080p resolution requirements.
 -   Requirements benchmarks are based on a statistic from the Passmark CPU bench marking software. When we say "STR", we are referring to Passmark's "Single Thread Rating" statistic. You can look up your CPU on [Passmark's website for CPUs](https://cpubenchmark.net) to see how it compares to PCSX2's requirements.
 -   Vulkan requires an up-to-date GPU driver; old drivers may cause graphical problems.
 
+## Contributing / Building
+Want to contribute to the development of PCSX2?
+
+See the [Contributing Guidelines](https://github.com/PCSX2/pcsx2/blob/master/.github/CONTRIBUTING.md) or visit the [GitHub Wiki](https://github.com/PCSX2/pcsx2/wiki)
+
 Want more? [Check out the PCSX2 website](https://pcsx2.net/).