Add account login function

.gitignore

@@ -1 +1,2 @@
+/accounts
 *.json

login.py

@@ -0,0 +1,19 @@
+from mastodon import Mastodon
+import os
+
+
+if __name__ == "__main__":
+    username = input("username: ")
+    name = input("application name: ")
+    url = input("server url: ")
+
+    if os.path.exists("accounts") and not os.path.isdir("accounts"):
+        print("accounts exists but isn't a directory")
+        exit(2)
+    elif not os.path.exists("accounts"):
+        os.mkdir("accounts")
+
+    Mastodon.create_app(name, to_file=f"accounts/{username}.client.secret", api_base_url=url, user_agent="fedifeeds")
+    masto = Mastodon(f"accounts/{username}.client.secret")
+    print(masto.auth_request_url())
+    masto.log_in(username, code=input("code: "), to_file=f"accounts/{username}.secret")