Pr/avatar (#319)

* feat: add avatar api
close #310

* chore: add description line

* fix: typo

* chore: reformat the json string to make it more readable and fix few bad indents

* fix: minimum go version

* feat: upload to Micro's CDN

* chore: delete redundant blank line

* chore: update README.md

avatar/Makefile

@@ -0,0 +1,28 @@
+
+GOPATH:=$(shell go env GOPATH)
+.PHONY: init
+init:
+	go get -u github.com/golang/protobuf/proto
+	go get -u github.com/golang/protobuf/protoc-gen-go
+	go get github.com/micro/micro/v3/cmd/protoc-gen-micro
+	go get github.com/micro/micro/v3/cmd/protoc-gen-openapi
+
+.PHONY: api
+api:
+	protoc --openapi_out=. --proto_path=. proto/avatar.proto
+
+.PHONY: proto
+proto:
+	protoc --proto_path=. --micro_out=. --go_out=:. proto/avatar.proto
+	
+.PHONY: build
+build:
+	go build -o avatar *.go
+
+.PHONY: test
+test:
+	go test -v ./... -cover
+
+.PHONY: docker
+docker:
+	docker build . -t avatar:latest