import .gitattributes from CPython (#6939)

.gitattributes

@@ -4,5 +4,65 @@ Cargo.lock  linguist-generated
 vm/src/stdlib/ast/gen.rs    linguist-generated -merge
 Lib/*.py    text working-tree-encoding=UTF-8 eol=LF
 **/*.rs     text working-tree-encoding=UTF-8 eol=LF
-*.pck       binary
 crates/rustpython_doc_db/src/*.inc.rs   linguist-generated=true
+
+# Binary data types
+*.aif binary
+*.aifc binary
+*.aiff binary
+*.au binary
+*.bmp binary
+*.exe binary
+*.icns binary
+*.gif binary
+*.ico binary
+*.jpg binary
+*.pck binary
+*.pdf binary
+*.png binary
+*.psd binary
+*.tar binary
+*.wav binary
+*.whl binary
+*.zip binary
+
+# Text files that should not be subject to eol conversion
+[attr]noeol -text
+
+Lib/test/cjkencodings/*                    noeol
+Lib/test/tokenizedata/coding20731.py       noeol
+Lib/test/decimaltestdata/*.decTest         noeol
+Lib/test/test_email/data/*.txt             noeol
+Lib/test/xmltestdata/*                     noeol
+
+# Shell scripts should have LF even on Windows because of Cygwin
+Lib/venv/scripts/common/activate text eol=lf
+Lib/venv/scripts/posix/* text eol=lf
+
+# CRLF files
+[attr]dos text eol=crlf
+
+# Language aware diff headers
+# https://tekin.co.uk/2020/10/better-git-diff-output-for-ruby-python-elixir-and-more
+# https://gist.github.com/tekin/12500956bd56784728e490d8cef9cb81
+*.css   diff=css
+*.html  diff=html
+*.py    diff=python
+*.md    diff=markdown
+
+# Generated files
+# https://github.com/github/linguist/blob/master/docs/overrides.md
+#
+# To always hide generated files in local diffs, mark them as binary:
+# $ git config diff.generated.binary true
+#
+[attr]generated linguist-generated=true diff=generated
+
+Lib/_opcode_metadata.py                             generated
+Lib/keyword.py                                      generated
+Lib/idlelib/help.html                               generated
+Lib/test/certdata/*.pem                             generated
+Lib/test/certdata/*.0                               generated
+Lib/test/levenshtein_examples.json                  generated
+Lib/test/test_stable_abi_ctypes.py                  generated
+Lib/token.py                                        generated