Add README and goosehints

.goosehints

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+Summary of the Program and Its Architecture:
+
+1. README.md:
+   • Introduces the purpose: to support the Mautrix Google Chat Authentication Process.
+   • Details manual steps to log in to https://chat.google.com, inspect browser cookies (COMPASS, SSID, SID, OSID, HSID) using Developer Tools, and form them into a JSON payload that is then sent to a bot to enable automated portal creation in chats.
+
+2. selenium_cookie_extractor_json.py:
+   • Uses Selenium with Chrome in incognito mode to open https://chat.google.com.
+   • The user is guided to log in and verify the necessary cookies via the browser’s Developer Tools.
+   • Once the user presses Enter, the script extracts all cookies, filters for the target cookies (with special handling for the COMPASS cookie by selecting the one with path "/" if present), and then outputs a JSON object with these cookie values.
+   • This JSON output can be used in further automation steps with a bot.
+
+3. flake.nix:
+   • Provides a Nix development shell configuration which ensures a reproducible environment.
+   • Specifies dependencies: Python3, Selenium, and Chromedriver, ensuring that the proper tools are available in the development environment.
+
+Overall Architecture:
+   • The repository is architected around a single-purpose automation tool to simplify cookie extraction for Google Chat authentication, with supporting documentation (README.md) and a reproducible development environment (flake.nix).

README.md

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+# Google Cookie Retrieval
+
+This is a simple Selenium script used to quickly run through the [Mautrix Google Chat Authentication Process](https://docs.mau.fi/bridges/python/googlechat/authentication.html).
+
+It was written primarily with [goose](https://github.com/block/goose) (honk!).
+
+## The goal: Automate this
+1. Open a private chat with the bridge bot. Usually @googlechatbot:your.server.
+    - If the bot doesn't accept the invite, see the troubleshooting page
+
+1. Open https://chat.google.com in a private browser window and log in normally, then extract cookies:
+    1. Press F12 to open developer tools.
+    1. select the "Application" (Chrome) or "Storage" (Firefox) tab.
+    1. In the sidebar, expand "Cookies" and select https://chat.google.com.
+    1. In the cookie list, find the COMPASS, SSID, SID, OSID and HSID rows.
+        - When using Firefox, you may have multiple COMPASS cookies with different paths. Pick the one where path is /.
+    1. Form a JSON object with the extracted cookies. It should look something like this (field names are case-insensitive):
+    ```json
+    {
+      "compass": "dynamite-ui=...",
+      "ssid": "...",
+      "sid": "...",
+      "osid": "...",
+      "hsid": "..."
+    }
+    ```
+    1. Close the browser window to prevent the cookies being invalidated (Google uses refresh tokens, so you need to close the window within a few minutes).
+1. Send login-cookie {the json object} to the bot.
+
+Recent chats should now get portals automatically. Other chats will get portals as you receive messages.