add readme for processlist plugin

package.json

@@ -95,7 +95,7 @@
         "c9.ide.readonly": "#f6f07bbe42",
         "c9.ide.recentfiles": "#7c099abf40",
         "c9.ide.remote": "#cd45e81d2f",
-        "c9.ide.processlist": "#9fd4807dd9",
+        "c9.ide.processlist": "#bc11818bb5",
         "c9.ide.run": "#71c5562e42",
         "c9.ide.run.build": "#ad45874c88",
         "c9.ide.run.debug.xdebug": "#b91d23f48b",