add samples for network tutorial

network/features.json

@@ -0,0 +1,10 @@
+{
+  "description": "The names of some Chrome DevTools Network panel features.",
+  "note": "https://developers.google.com/web/tools/chrome-devtools/network-performance depends on this file.",
+  "features": [
+    "Network Throttling",
+    "Screenshots",
+    "Disable Cache",
+    "Replay XHR"
+  ]
+}

network/panels.json

@@ -0,0 +1,15 @@
+{
+  "description": "The names of Chrome DevTools panels.",
+  "note": "https://developers.google.com/web/tools/chrome-devtools/network-performance depends on this file.",
+  "panels": [
+    "Elements",
+    "Sources",
+    "Console",
+    "Network",
+    "Application",
+    "Memory",
+    "Performance",
+    "Security",
+    "Audits"
+  ]
+}