Update README.md

Author: javigomez

README.md

@@ -1,6 +1,30 @@
 # teststatistics
 Codeception Extension to measure the performance of your tests
 
+After running your tests you will see a Performance report of your tests:
+
+```
+Tests Performance times
+-----------------------------------------------
+tagCest::create                     6s
+tagCest::edit                       15s
+tagCest::delete                     3s
+
+
+Slow Steps (Steps taking more than 3s)
+-----------------------------------------------
+I click button 6s
+```
+
+## Installation
+Add teststatistics to your composer.json
+
+```yaml
+  "require-dev": {
+    ...
+    "redcomponent/teststatistics": "dev-master",
+```
+
 ## Useage
 Simply add to your extensions the line at the bottom in the following example in your codeception.yml: