chore: update README.md with instructions on how to update zerokit

README.md

@@ -1,3 +1,61 @@
 # go-zerokit-rln
 
 Go wrappers for [zerokit's RLN](https://github.com/vacp2p/zerokit)
+
+
+
+### Updating vacp2p/zerokit
+
+To overcome the limit of 500mb github has for repositories, go-zerokit-rln depends on 3 projects:
+- https://github.com/waku-org/go-zerokit-rln-apple
+- https://github.com/waku-org/go-zerokit-rln-arm
+- https://github.com/waku-org/go-zerokit-rln-x86_64
+
+Zerokit must be updated in these 3 repositories. The instructions are the same for each of the architectures,
+except for `-apple` which require macos to be executed. You need to have docker and rust installed.
+
+```bash
+export GO_RLN_ARCH=x86_64       # Replace this for x86_64, arm or apple
+export ZEROKIT_COMMIT=master    # Use a commit, branch or tag
+
+git clone https://github.com/waku-org/go-zerokit-rln_${GO_RLN_ARCH}
+cd go-zerokit-rln-${GO_RLN_ARCH}
+git submodule init
+git submodule update --recursive
+cd zerokit
+git pull
+git checkout ${ZEROKIT_COMMIT}
+cd ..
+make
+git add zerokit
+git add libs/*/librln.a
+git commit -m "chore: bump zerokit"
+git push
+```
+
+Once you execute the previous commands for each one of the architectures, update go.mod:
+```bash
+cd /path/to/go-zerokit-rln
+go get github.com/waku-org/go-zerokit-rln-apple@latest
+go get github.com/waku-org/go-zerokit-rln-arm@latest
+go get github.com/waku-org/go-zerokit-rln-x86_64@latest
+git checkout master
+git add go.mod
+git add go.sum
+git commit -m "chore: bump zerokit"
+git push
+```
+
+And later in go-waku, update the go-zerokit-rln dependency with
+```
+cd /path/to/go-waku
+git fetch
+git checkout -b `date +"%Y%m%d%H%M%S"-bump-zerokit` origin/master
+go get github.com/waku-org/go-zerokit-rln@latest
+git add go.mod
+git add go.sum
+git commit -m "chore: bump go-zerokit-rln"
+git push
+````
+And create a PR
+