add install instructions to README

README.md

@@ -6,8 +6,30 @@ a tui music tagger based on [lofty](https://docs.rs/lofty) and
 
 ## installation
 
+### download binary
+
+see the [releases page](https://codeberg.org/unspeaker/perch/releases).
+
+### build from source with cargo
+
 install with cargo from source:
 
 ```
 cargo install --git https://codeberg.org/unspeaker/perch
 ```
+
+### build from source with docker
+
+compile static build in docker:
+
+```
+git clone https://codeberg.org/unspeaker/perch # obtain source
+cd perch                                       # enter directory
+cat bin/release-glibc.sh                       # preview build script
+sudo bin/release-glibc.sh                      # run build script
+sudo cp bin/perch /usr/local/bin/perch         # install
+```
+
+### build from source with nix
+
+how?