mytop: add page (#2741)

pages/common/mytop.md

@@ -0,0 +1,20 @@
+# mytop
+
+> Display MySQL server performance info like `top`.
+> Homepage: <http://www.mysqlfanboy.com/mytop-3>.
+
+- Start mytop:
+
+`mytop`
+
+- Connect with a specified username and password:
+
+`mytop -u {{user}} -p {{password}}`
+
+- Connect with a specified username (the user will be prompted for a password):
+
+`mytop -u {{user}} --prompt`
+
+- Do not show any idle (sleeping) threads:
+
+`mytop -u {{user}} -p {{password}} --noidle`