Protobuf Java and Kotlin code generation. (#64)

Co-authored-by: Stian Brandt <stian.brandt@it-smurfan.no>

api/java/Makefile

@@ -0,0 +1,23 @@
+.PHONY: build
+
+all: clean build jar
+
+clean:
+	@echo "Cleaning..."
+	@./gradlew clean
+	@echo "Clean."
+
+build:
+	@echo "Building..."
+	@./gradlew build
+	@echo "Build complete."
+
+jar: build
+	@echo "Generating jar..."
+	@./gradlew jar
+	@echo "Jar generated in build/libs."
+
+install: build
+	@echo "Installing artifact in local repository..."
+	@./gradlew publishToMavenLocal
+	@echo "Artifact installed in local repository ~/.m2"