Update README.md for mobile devices. (#115)

* Update README.md for mobile devices.

* Add todo for more makes and models.

README.md

@@ -29,6 +29,9 @@ The following devices have actually been tested and confirmed to work:
 - Canon
    - Canon EOS M6 ([@tardisx](https://github.com/tardisx))
    - Canon EOS RP ([@wolcano](https://github.com/wolcano))
+- Mobile Devices (beta)
+   - Android
+   - iOS
 
 ## What Works
 
@@ -91,6 +94,16 @@ previously paired device and leads to the remote menu.
 
 From the remote menu you may choose to disconnect or control the shutter.
 
+### Mobile Devices
+
+Android and iOS devices are supported. `furble` connects as a Bluetooth HID keyboard and sends the _Volume Up_ key stroke to trigger the shutter.
+Connection to mobile devices is a little iffy:
+- hit `Scan`
+- on the mobile device:
+   - pair with `furble`
+- on `furble` the mobile device bluetooth MAC address should appear as a connectable target
+   - fixing the target name is tracked in [#100](https://github.com/gkoh/furble/issues/100).
+
 ### GPS Location Tagging
 
 For Fujifilm cameras, location tagging is supported with the M5Stack GPS unit:
@@ -194,6 +207,12 @@ the following libraries:
   the M5StickC boots quickly)
 - improve the device matching and connection abstractions
   - especially if more cameras get supported
+- Support more camera makes and models
+   - Complete support for newer Canon EOS (eg. RP)
+   - Get access to and support the following:
+     - Sony
+     - Nikon
+     - Others?
 
 # Links