added devcontainer

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+{
+  "name": "Go Dev Container",
+  "build": {
+    "dockerfile": "Dockerfile"
+  },
+  "settings": {
+    "go.gopath": "/go"
+  },
+  "extensions": [
+    "golang.Go"
+  ],
+  "forwardPorts": [8080],
+  "postCreateCommand": "go mod tidy"
+}