Updated Provide native lib for libsignal (markdown)

Provide-native-lib-for-libsignal.md

@@ -35,7 +35,6 @@ Builds for some additional platforms are available in
 - JDK
 - gradle
 - rust (Guide [here](https://www.rust-lang.org/tools/install))
-- protocol buffer compiler ("apt install protobuf-compiler")
 
 #### Download libsignal-client source
 
@@ -67,6 +66,30 @@ Then the native lib can be found in the folder: `client/src/main/resources/libsi
 
 ### Using the new libsignal-client lib file
 
+#### Option 1: Compile signal-cli with a custom libsignal-client build
+
+For this option, the java part of libsignal-client must be built as well. Run the following command in the libsignal-client `java` folder.
+
+```sh
+# Run in libsignal-client/java folder
+$ ./gradlew --no-daemon :client:assemble -PskipAndroid=true
+```
+
+Then build signal-cli with the `libsignal_client_path` option to use that jar file.
+
+```sh
+# Run in signal-cli folder
+$ ./gradlew -Plibsignal_client_path="/PATH/TO/libsignal-client/java/client/build/libs/libsignal-client-0.15.0.jar" build
+```
+
+Or this command to build the signal-cli graalvm native version.
+```sh
+# Run in signal-cli folder
+$ ./gradlew -Plibsignal_client_path="/PATH/TO/libsignal-client/java/client/build/libs/libsignal-client-0.15.0.jar" nativeCompile
+```
+
+#### Option 2: Replace just native library file (.so, .dll, .dylib)
+
 Once you have your library file, it can be bundled in the root of the `libsignal-client-*.jar` file. 
 
 First, the currently bundled file needs to be removed: