chore: add .gitattributes and .gitmessage for commit message guidelines

.gitattributes

@@ -0,0 +1 @@
+*.ipynb filter=nbstripout

.gitmessage

@@ -0,0 +1,30 @@
+# .gitmessage
+
+# <type>(<scope>): <subject>
+# |<----  Using a Maximum Of 50 Characters  ---->|
+# 
+# Explain the problem that this commit is solving. Focus on why you
+# are making this change as opposed to how. Use clear, concise language.
+# |<----   Try To Limit Each Line to a Maximum Of 72 Characters   ---->|
+#
+# -- COMMIT END --
+# Types:
+#   feat     (new feature)
+#   fix      (bug fix)
+#   refactor (refactoring code)
+#   style    (formatting, no code change)
+#   doc      (changes to documentation)
+#   test     (adding or refactoring tests)
+#   perf     (performance improvements)
+#   chore    (routine tasks, dependencies)
+#   exp      (experimental work/exploration)
+# 
+# Scope:
+#   latex    (changes to thesis LaTeX)
+#   src      (changes to Python source code)
+#   nb       (changes to notebooks)
+#   ml       (ML model specific changes)
+#   data     (data processing/preparation)
+#   viz      (visualization related)
+#   all      (changes spanning entire repository)
+# --------------------