make packer usable as lib

README.md

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+# Upkr
+
+Upkr is a simple general purpose lz packer designed to be used in the [MicroW8](https://github.com/exoticorn/microw8) platform.
+The compressed format is base on [Shrinkler](https://github.com/askeksa/Shrinkler) with the main difference being that
+Upkr doesn't differnetiate between literals at odd or even addresses.
+
+At this point, Upkr should be considered unstable - the exact format isn't finalized yet and still subject to change
+and only a very simple (but also very fast) greedy compressor is implemented. The compression ratio will be improved
+with a more thourough lz parse in the future, although even in the current state is is already similar to the
+DEFLATE compression algorithm.