add CLI draft

docs/get-started-cli.md

@@ -0,0 +1,22 @@
+# Get started with the CLI
+
+## Create a new project
+
+Create a new folder for your project, `my-project`. Change into it, and set `AMCS_CONTENT` to the folder that should store your content.
+
+```
+mkdir -p my-project
+cd my-project
+export ACMS_CONTENT=$PWD/content
+```
+
+## Create a restaurant collection
+
+```
+acms collection insert restaurant/1.json <<'EOF'
+{
+    "name": "Biscotte Restaurant",
+    "description": "Welcome to Biscotte restaurant! Restaurant Biscotte offers a cuisine based on fresh, quality products, often local, organic when possible, and always produced by passionate producers."
+}
+EOF
+```