Expand readme

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

README.md

@@ -3,6 +3,78 @@
 A [Nim] library for writing audio and MIDI plugins conforming to the [LV2] standard
 
 
+## Examples
+
+Build the `amp.lv2` example plugin:
+
+    nimble build_ex amp
+
+Check the `amp.lv2` plugin bundle with `lv2lint`:
+
+    nimble lv2lint amp
+
+Run the `lv2bm` benchmark with the `amp.lv2` plugin:
+
+    nimble lv2bm amp
+
+Install the `amp.lv2` example plugin:
+
+    cp -a examples/amp.lv2 ~/.lv2
+
+
+## How To
+
+* Install this library:
+
+        nimble install https://git.0x20.eu/chris/nymph
+
+* Copy `examples/amp.lv2` and `examples/amp.nim` into your project and rename
+  them as you like (also rename `amp.lv2/amp.ttl`). I'll use `myplugin` as the
+  base name in the examples below.
+
+* Edit `myplugin.lv2/manifest.ttl` and change the plugin URI and change the
+  plugin's shared library name defined with `lv2:binary` to `libmyplugin.so`.
+
+* Edit `myplugin.lv2/myplugin.ttl`:
+    * Change the plugin URI.
+    * Define audio, control and atom ports as needed.
+
+* Edit `myplugin.nim`:
+    * Change the `PluginUri` constant at the top.
+    * Change the `PluginPort` enum and list the ports in the order defined in
+      `myplugin.ttl`.
+    * Rename and update the definition of the `AmpPlugin` object type and
+      define its members with the appropriate data type for the plugin port
+      they will be connected to. Update the type name in the `instantiate`,
+      `deactivate`, `connectPorts` and `run` procs.
+    * Update and extend the `case` statement in `connectPort` to connect ports
+      to your plugin object instance members.
+    * Implement your DSP code in the `run` proc.
+
+* Compile the plugin shared library object with:
+
+        nim c --app:lib --noMain:on --mm:arc \
+            --out:myplugin.lv2/libmyplugin.so myplugin.nim
+
+    See the definition of the `build_ex` task in the
+    [nymph.nimble](./nymph.nimble#L43) file on how to create a nimble task
+    to simplify compilation.
+
+
+## Dependencies
+
+Required:
+
+* [Nim] >= 2.0
+
+Optional:
+
+* [lv2bm] - For benchmarking and stress-testing plugins
+* [lv2lint] - For checking conformity of plugin bundles
+
+
 [LV2]: https://lv2plug.in/
+[lv2bm]: https://github.com/moddevices/lv2bm
+[lv2lint]: https://git.open-music-kontrollers.ch/~hp/lv2lint
 [Nim]: https://nim-lang.org/