Updated README (#4)

* Updates to picofuse

* Updated pool code

* Added fuse application

* Updates

* Updates

* Updated

* Updated pool

* Updated to compile for pico

* Added LED

* Updated code and added blink test

* Updated ADC

* WIP: GPIO events

* Updated assert

* Updated documentation

* Added docs

* Updated

* Updated README

* Updated the README file

README.md

@@ -6,12 +6,21 @@ is available here:
 
   * https://mutablelogic.github.io/pico-fuse/
 
+The library consists of ``fuse`` which provides data structures and methods for memory pools,
+hash maps, linked lists and strings, plus ``picofuse`` which contains device- and platform-
+specific code for the Raspberry Pi Pico. It's possible to use ``fuse`` on its own, but
+``picofuse`` depends on ``fuse``.
+
 The following sections provide more information on how to use this library:
 
   * [Dependencies](#dependencies)
   * [Configuration](#configuration)
   * [References](#references)
 
+The library is published under the Apache license, so feel free to use and fork it, but
+please acknowledge the source in any forks. See the [LICENSE](LICENSE) file for more
+information.
+
 ## Dependencies
 
 On Fedora Linux, the following packages need installed: