docs: add NOTES & TODO

Author: cybex-dev

NOTES.md

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+# Notes
+
+The plugin is intended to be used as a boilerplate for call management and not as a full-fledged voip solution. The plugin facilitates handling of calls via a simple API and provides a browser call control mechanism through browser notifications. 
+
+_Thus, core features such as audio handling, RTC/SIP connections, websocket communication, etc. are not provided by the plugin and should be handled via 3rd party resources._
+
+Core tenets of the plugin:
+1. Transparency: the user should at all times be aware of any call on their device.
+2. Accessibility: the user should be able to interact with the call in any state.
+3. (Future work) flexibility within the Callkit structure.
+
+Future work may include:
+- Integration with RTC/SIP connections
+- Websocket communication
+- Audio & VIDEO handling
+- Integration with native callkit frameworks
+

TODO.md

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+# TODO
+
+* Add DisplayType to determine how call notifications are displayed/grouped together
+  * Individual
+  * Grouped
+  * GroupAfter3
+* Add images to enhance callkit UI
+  * Active
+  * Holding
+  * Muted
+  * Incoming
+  * Ringing
+  * Disconnecting
+* AudioManager