Created FAQ (markdown)

FAQ.md

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+* **Q.** How do I use the second y axis, secondYAxis function does not work
+
+  **A.** You can switch any series to the second y axis by clicking on the colored line to left of the series name in the legend below the graph.
+
+* **Q.** How do I exit graph edit mode? 
+
+  **A.** Hit the escape key or click the graph title and select edit again.  
+