Add badges to README

README.md

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 # py_cppmodel
 
+[![license][badge.license]][license] [![issues][badge.issues]][issues]
+[![pre-commit][badge.pre-commit]][pre-commit]
+
+[badge.license]: https://img.shields.io/badge/license-MIT-blue.svg
+[badge.issues]: https://img.shields.io/github/issues/jbcoe/py_cppmodel.svg
+[badge.pre-commit]: https://img.shields.io/badge/pre--commit-enabled-brightgreen?logo=pre-commit
+
+[license]: https://en.wikipedia.org/wiki/MIT_License
+[issues]: http://github.com/jbcoe/py_cppmodel/issues
+[pre-commit]: https://github.com/pre-commit/pre-commit
+
 `py_cppmodel` is a Python wrapper around clang's python bindings to generate a
 simple Python model of a C++ translation unit.