add zapstore publishing instructions

RELEASE.md

@@ -10,4 +10,16 @@
 
 3. Submit to app stores
  - `eas submit --platform android`
- - `eas submit --platform ios`
+ - `eas submit --platform ios`
+
+# Zapstore
+
+Pre-requirements to have installed:
+- `sudo apt install apksigner`
+- https://github.com/sibprogrammer/xq \
+- https://github.com/zapstore/zapstore-cli \
+
+1. Make sure you have the apk file locally, either by building it with `eas --local --profile production_apk --output=./alby-go-<version>-android.apk` or downloading it from expo.dev or github release.
+2. `zapstore publish albygo -a alby-go-<version>-android.apk -r <version>`
+3. use Alby nsec to sign during zapstore publish
+