Support VS Code container devenv (#10723)

* add devcontainer.json for devenv

* add devenv file

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+{
+    "image": "netdata/devenv", 
+    "extensions":[
+		"golang.go",
+		"exiasr.hadolint",
+		"ms-python.python",
+		"timonwong.shellcheck",
+		"redhat.vscode-yaml",
+		"dbaeumer.vscode-eslint",
+		"jasonnutter.search-node-modules",
+		"mgmcdermott.vscode-language-babel",		
+	],
+    "forwardPorts": [19999]
+}