feat: add .gitattributes

Former-commit-id: 52d09d87e88acd997d82f109e028cb69310d4019 [formerly 0c52b6da0ddb4d90d6193a5e8b1a3d12ce8b1763]
Former-commit-id: e32ed4b3121d1fd76a7ec55677621a351f0b1655

.gitattributes

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+# https://github.com/alexkaratarakis/gitattributes/blob/master/Python.gitattributes
+# Basic .gitattributes for a python repo.
+
+# Source files
+# ============
+*.pxd text diff=python
+*.py text diff=python
+*.py3 text diff=python
+*.pyw text diff=python
+*.pyx text diff=python
+*.pyz text diff=python
+*.pyi text diff=python
+
+# Binary files
+# ============
+*.db binary
+*.p binary
+*.pkl binary
+*.pickle binary
+*.pyc binary export-ignore
+*.pyo binary export-ignore
+*.pyd binary
+
+# Jupyter notebook
+*.ipynb text
+
+# Note: .db, .p, and .pkl files are associated
+# with the python modules ``pickle``, ``dbm.*``,
+# ``shelve``, ``marshal``, ``anydbm``, & ``bsddb``
+# (among others).