Update go module, update README to run

Makefile

@@ -10,7 +10,7 @@ DOCKER_VERSION=latest
 
 all: test clean build
 clean:
-	rm -rf $(BUILDPATH); mkdir $(BUILDPATH)
+	go mod tidy; rm -rf $(BUILDPATH); mkdir $(BUILDPATH)
 test: 
 	$(GOTEST) ./...
 build: 

README.md

@@ -35,6 +35,12 @@ Start with docker:
 docker run -p 8080:8080 ledongthuc/mathgen-web:latest
 ```
 
+Start from source code:
+
+```
+make clean; make test; make run;
+```
+
 ### API
 
 #### Addition

go.mod

@@ -0,0 +1,10 @@
+module github.com/ledongthuc/mathgen
+
+go 1.12
+
+require (
+	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
+	github.com/labstack/echo v3.3.10+incompatible
+	github.com/labstack/gommon v0.3.0
+	golang.org/x/crypto v0.0.0-20200117160349-530e935923ad // indirect
+)

go.sum

@@ -0,0 +1,38 @@
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