Add PHONY, example and clean to Makefile

Makefile

@@ -4,8 +4,12 @@ ifeq ($(origin GOPATH), undefined)
     GOPATH := $(HOME)/go
 endif
 
+.PHONY: all test clean example
+
 all: capnp test
 
+clean: capnp-clean example-clean
+
 
 capnp: capnp-raft
 # N.B.:  compiling capnp schemas requires having capnproto.org/go/capnp/v3 installed
@@ -15,7 +19,16 @@ capnp-raft:
 	@mkdir -p proto/api
 	@capnp compile -I$(GOPATH)/src/capnproto.org/go/capnp/v3/std -ogo:proto/api --src-prefix=proto proto/raft.capnp
 
-test: test-wasm
+capnp-clean:
+	@rm -rf proto/api
+
+example:
+	@gotip build -o ./example/example ./example
+
+example-clean:
+	@rm ./example/example
+
+test: test-wasm example example-clean
 
 # Test that everything can be compiled to wasm
 test-wasm: