Add devcontainer config

Author: silvadenisaraujo

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/typescript-node:0-16
+
+# Set vtex-test in path
+ENV PATH="${PATH}:/home/node/.vtex/dev/bin"

.devcontainer/devcontainer.json

@@ -0,0 +1,4 @@
+{
+  "build": { "dockerfile": "Dockerfile" },
+  "forwardPorts": [3000]
+}