Add badges for download , licence and lgtm

Author: zdenop

README.md

@@ -4,7 +4,10 @@
 [![Build status](https://ci.appveyor.com/api/projects/status/miah0ikfsf0j3819/branch/master?svg=true)](https://ci.appveyor.com/project/zdenop/tesseract/)<br>
 [![Coverity Scan Build Status](https://scan.coverity.com/projects/tesseract-ocr/badge.svg)](https://scan.coverity.com/projects/tesseract-ocr)
 [![Insight.io](https://www.insight.io/repoBadge/github.com/tesseract-ocr/tesseract)](https://insight.io/github.com/tesseract-ocr/tesseract)
-
+[![Code Quality: Cpp](https://img.shields.io/lgtm/grade/cpp/g/tesseract-ocr/tesseract.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/tesseract-ocr/tesseract/context:cpp)
+[![Total Alerts](https://img.shields.io/lgtm/alerts/g/tesseract-ocr/tesseract.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/tesseract-ocr/tesseract/alerts)<br/>
+[![GitHub license](https://img.shields.io/badge/license-Apache--2.0-blue.svg)](https://raw.githubusercontent.com/tesseract-ocr/tesseract/master/LICENSE)
+[![Downloads](https://img.shields.io/badge/download-all%20releases-brightgreen.svg)](https://github.com/tesseract-ocr/tesseract/releases/)
 
 ## About