Add a GitHub Python submodule.

Under the rcfiles module. Similar to the GitLab submodule.

Documents/bin/rcfiles/github.py

+"""A bunch of convenience functions to deal with GitHub."""
+
+import os
+import github3  # pylint: disable=import-error
+
+
+def connect():
+    """Return a GitHub session."""
+    try:
+        token = os.environ["GITHUB_TOKEN"]
+    except KeyError:
+        raise Exception("GITHUB_TOKEN environment variable not set.")
+    return github3.login(token=token)
+
+
+def github_me(conn):
+    """Return my GitHub account name."""
+    return conn.me().login
+
+
+def create_repo(  # pylint: disable=too-many-arguments
+    conn, name, description="", homepage="", has_issues=False, has_wiki=False
+):
+    """Create a new GitHub repository under the login namespace."""
+    return conn.create_repository(
+        name, description, homepage, has_issues=has_issues, has_wiki=has_wiki
+    )
+
+
+def get_repo(conn, name):
+    """Return the GitHub repo object with the given name."""
+    me = github_me(conn)  # pylint: disable=invalid-name
+    for i in conn.repositries_by(me, type="owner"):
+        if i.name == name:
+            return i
+    raise Exception(f"Could not find the {name} GitHub repository.")
+
+
+def read_only_github(conn, name):
+    """Make a GitHub repository read-only."""
+    repo = get_repo(conn, name)
+    repo.edit(name, archived=True)