[comments] add FIXME and TODO annotations. Fixes airbnb#62

Author: hshoff

README.md

@@ -668,6 +668,32 @@
     }
     ```
 
+  - Prefixing your comments with `FIXME` or `TODO` helps other developers quickly understand if you're pointing out a problem that needs to be revisited, or if you're suggesting a solution to the problem that needs to be implemented. These are different than regular comments because they are actionable. The actions are `FIXME -- need to figure this out` or `TODO -- need to implement`.
+
+  - Use `// FIXME:` to annotate problems
+
+    ```javascript
+    function Calculator() {
+
+      // FIXME: shouldn't use a global here
+      total = 0;
+
+      return this;
+    }
+    ```
+
+  - Use `// TODO:` to annotate solutions to problems
+
+    ```javascript
+    function Calculator() {
+
+      // TODO: total should be configurable by an options param
+      this.total = 0;
+
+      return this;
+    }
+  ```
+
     **[[⬆]](#TOC)**