Update readme.md

README.md

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 # isMongoObjectID
 Super fast function to check if a String is a MongoDB ObjectID based on ES6 Sets.
+
+## Why?
+Because **performance does matter**.
+
+**isMongoObjectID** is almost **6x faster** than **objectid.isValid** (from objectid module)
+
+## Measurements
+
+We check 2 Strings: one with objectID formant and another with invalid format for each case. (We use **performance-node** module for measures).
+
+After several execution we get the following results:
+
+```sh
+{ name: 'objectid.isValid(id)-measure',
+  startTime: 0.8244399875402451,
+  duration: 6.259790003299713,
+  entryType: 'measure' }
+{ name: 'isValidObjectID(id)-measure',
+  startTime: 24.24372299015522,
+  duration: 1.0192510038614273,
+  entryType: 'measure' }
+```