Add MANIFEST.in to exclude specific files from sdist package

Author: amotl

CHANGELOG.md

@@ -19,6 +19,7 @@
 * Refactoring: Rename module names and references
 * Format code with `black` and `isort`
 * Improve inline documentation
+* Add `MANIFEST.in` to exclude specific files from `sdist` package
 
 
 <a name="1.0.3"></a>

MANIFEST.in

@@ -0,0 +1,4 @@
+# `setuptools_scm` already includes all files tracked by Git.
+# This explicitly excludes specific committed files not needed in the sdist package.
+exclude .gitattributes .gitignore Makefile CODEOWNERS
+prune .github