Create CONTRIBUTING.md

Author: laffra

CONTRIBUTING.md

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+# Contributing to LTK
+
+If you found a bug with LTK, please [open an issue](https://github.com/laffra/ltk/issues/new).
+
+If you have an idea on making LTK better, please send a Pull Request.
+
+Build something with LTK and add your app to the [list of applications built with LTK](https://github.com/laffra/ltk/blob/main/README.md#applications-built-using-ltk).
+
+Come watch a talk by [Chris Laffra](https://chrislaffra.com) on LTK at [PyData Eindhoven](https://eindhoven2023.pydata.org/pydata/talk/RJVRMT/) on November 30, 2023.