docs: improve readme

README.md

@@ -2,6 +2,33 @@
 
 [![PyPI version](https://badge.fury.io/py/vpx-rtp-py.svg)](https://badge.fury.io/py/vpx-rtp-py)
 
-python library for encoding/decoding video rtp streams using `libvpx`, loosly forked from `aiortc`.
+a creatively named python library for encoding/decoding video rtp streams using `cffi` bindings to `libvpx`, loosely forked / slimmed down from [aiortc](https://github.com/aiortc/aiortc).
 
-narrowly constructed for the use cases of [Tutor Intelligence](http://tutorintelligence.com/), but feel free to post an issue or PR if relevant to you.
+narrowly constructed for the use cases of [Tutor Intelligence](http://tutorintelligence.com/), but feel free to post an issue or PR if relevant to you.
+
+### install steps
+
+be sure you have `libvpx` installed on your computer, otherwise `vpx-rtp-py` will not work (even if installed via `pip`).  to do so:
+
+```
+# ubuntu
+sudo apt install libvpx-dev
+```
+
+```
+# mac
+brew install libvpx
+```
+
+then install via pypi:
+
+```
+pip install vpx-rtp-py
+```
+
+### limitations
+
+ - does not really support RTCP or anything special/bidirectional (eg packet loss acknowledgement, retransmission packets)
+ - does not support SSL
+ - only supports `vp8` and `vp9` video encoding
+ - pypi pre-built wheels only support linux + x86_64 + python 3.10.  if you want to add support for other platforms, feel free to update our `cd.yml` in a PR.