Add a rich example of fn framework for abstraction

functions/examples/fn-framework-application/Makefile

@@ -0,0 +1,25 @@
+export KUSTOMIZE_ROOT ?= $(shell pwd | sed -E 's|(.*\/kustomize)/(.*)|\1|')
+include $(KUSTOMIZE_ROOT)/Makefile-modules.mk
+
+CONTROLLER_GEN_VERSION=v0.11.3
+
+generate: $(MYGOBIN)/controller-gen $(MYGOBIN)/embedmd
+	go generate ./...
+	embedmd -w README.md
+
+build: generate
+	go build -v -o $(MYGOBIN)/app-fn cmd/main.go
+
+$(MYGOBIN)/controller-gen:
+	go install sigs.k8s.io/controller-tools/cmd/controller-gen@$(CONTROLLER_GEN_VERSION)
+
+$(MYGOBIN)/embedmd:
+	go install github.com/campoy/embedmd@v1.0.0
+
+.PHONY: example
+example: build
+	$(MYGOBIN)/app-fn pkg/exampleapp/testdata/success/basic/config.yaml
+
+
+test: generate
+	go test -v -timeout 45m -cover ./...