docs: add project status and installation sections to readme

Signed-off-by: Christopher Arndt <chris@chrisarndt.de>

README.md

@@ -3,12 +3,38 @@
 A [Nim] wrapper for the [JACK] [C API]
 
 
+## Project status
+
+This software is in *alpha status* and has no official release yet.
+
+The basic JACK APIs (client lifecycle, ports, callbacks) have been wrapped and
+are functional (see [examples]), but MIDI, transport and meta-data APIs still 
+need wrapping. Also, symbol names may still be changed and things moved around
+before the first public release.
+
+Also, I plan to add a higher-level abstraction on top of the direct mapping
+from Nim procs and types to C functions and types, probably in the form of
+a JACk client object, which takes care of a JACK client instance, registering
+ports and setting up all the callbacks necessary for a well-behaved JACK 
+application.
+
+
+# Installation
+
+* Clone this repository.
+* Change into the `jacket` directory.
+* Run [`nimble install`] (or `nimble develop`).
+* Run the examples with `nim compile --run examples/<example>.nim`.
+
+
 ## License
 
 This software is released under the *MIT License*. See the [LICENSE](./LICENSE)
 file for more information.
 
 
+[`nimble install`]: https://github.com/nim-lang/nimble#nimble-usage
 [C API]: https://jackaudio.org/api/
+[examples]: ./examples
 [JACK]: https://jackaudio.org/
 [Nim]: https://nim-lang.org/