README.md: add intro to vs-openvino

Signed-off-by: akarin <[email protected]>

README.md

@@ -1,3 +1,17 @@
 # vs-mlrt
 
-VapourSynth ML filter runtime.
+VapourSynth ML filter runtimes.
+
+Please see [the wiki](https://github.com/AmusementClub/vs-mlrt/wiki) for supported models.
+
+## vsov: OpenVINO-based Pure CPU Runtime
+
+[OpenVINO](https://docs.openvino.ai/latest/index.html) is an AI inference runtime developed
+by Intel, mainly targeting x86 CPUs and Intel GPUs.
+
+The vs-openvino plugin provides optimized *pure* CPU runtime for some popular AI filters,
+with Intel GPU support planned in the future.
+
+To install, download the latest release and extract them into your VS `plugins` directory.
+
+Please visit the [vsov](vsov) directory for details.