useful readmes are more useful than empty readmes

Author: robotgryphon

README.md

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 # spatial
+
+A library for working with blocks in space. No, not that Space.
+
+More stuff to come soon as I drag things out of the other Compact mods and centralize it here. Pull Requests for adding similar functionality encouraged!
+
+## Useful stuff
+- `AABBHelper` - has utilities for calculating corners of AABB instances, normalizing AABB instances to zero/other instances, and writing the data out to a string in a less-painful way.
+
+
+
+## Contributing
+this just started pls not yet