feat: async sa index

Author: faretek1

docs/attach/index.md

@@ -0,0 +1,41 @@
+# scratchattach
+
+Scratchattach is a scratch-API wrapper. This directory documents the WIP asynchronous API.
+
+## Logging in
+
+### Logging in with username & password: 
+
+```py
+import os
+import asyncio
+import scratchattach.async_api as sa
+from dotenv import load_dotenv
+
+load_dotenv()
+
+async def main():
+    async with await sa.login(os.environ["SA_USERNAME"], os.environ["SA_PASSWORD"]) as sess:
+        print(sess.user_id)
+
+if __name__ == "__main__":
+    asyncio.run(main())
+```
+
+### Logging in with session id
+
+```py
+import os
+import asyncio
+import scratchattach.async_api as sa
+from dotenv import load_dotenv
+
+load_dotenv()
+
+async def main():
+    async with await sa.login_by_id(os.environ["SA_ID"]) as sess:
+        print(sess.user_id)
+
+if __name__ == "__main__":
+    asyncio.run(main())
+```