chore: recommended vscode extensions

Go, test explorer, github, prettier, markdwon all-in-one and markdownlint

.vscode/extensions.json

@@ -0,0 +1,11 @@
+{
+  "recommendations": [
+    "golang.go",
+    "hbenl.vscode-test-explorer",
+    "ethan-reesor.vscode-go-test-adapter",
+    "github.vscode-pull-request-github",
+    "esbenp.prettier-vscode",
+    "davidanson.vscode-markdownlint",
+    "yzhang.markdown-all-in-one"
+  ]
+}