File type check and command component

constants/Commands.js

@@ -0,0 +1,10 @@
+export default {
+    EXAMPLE_COMMAND: [
+        { argument: "tree", description: null},
+        { argument: "-h", description: "Human readable size" },
+        { argument: "--du", description: "Calculate total folder size" },
+        { argument: "-L 2", description: "Max depth" },
+        { argument: "> tree.json", description: "Save output into file" },
+    ]
+}
+