add api notebook

.vscode/notebooks/api.github-issues

+[
+  {
+    "kind": 1,
+    "language": "markdown",
+    "value": "#### Config",
+    "editable": true
+  },
+  {
+    "kind": 2,
+    "language": "github-issues",
+    "value": "$repo=repo:microsoft/vscode\n$milestone=milestone:\"July 2020\"",
+    "editable": true
+  },
+  {
+    "kind": 1,
+    "language": "markdown",
+    "value": "### Finalization",
+    "editable": true
+  },
+  {
+    "kind": 2,
+    "language": "github-issues",
+    "value": "$repo $milestone label:api-finalization",
+    "editable": true
+  },
+  {
+    "kind": 1,
+    "language": "markdown",
+    "value": "### Proposals",
+    "editable": true
+  },
+  {
+    "kind": 2,
+    "language": "github-issues",
+    "value": "$repo $milestone is:open label:api-proposal ",
+    "editable": true
+  }
+]
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