Enable go module support for go environment (#1152)

examples/go/module-example/README.md

@@ -0,0 +1,35 @@
+# Go module usage
+
+1. Initialize your project
+
+```bash
+$ go mod init "<module>"
+```
+
+For example,
+
+```bash
+$ go mod init "github.com/fission/fission/examples/go/go-module-example"
+```
+
+2. Add dependencies
+
+ * See [here](https://github.com/golang/go/wiki/Modules#daily-workflow)
+
+3. Verify
+
+```bash
+$ go mod verify
+```
+
+4. Archive and create package as usual
+
+```bash
+$ zip -r go.zip .
+    adding: go.mod (deflated 26%)
+    adding: go.sum (deflated 1%)
+    adding: README.md (deflated 37%)
+    adding: main.go (deflated 30%)
+    
+$ fission pkg create --env go --src go.zip
+```