lgtm: Add code analysis platform

To improve the code quality, we introduce lgtm. The status can be
seen in README.

Reference: https://lgtm.com/

Signed-off-by: Saya Sugiura <ssugiura@jp.adit-jv.com>

1 files changed, 2 insertions, 0 deletions

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 # Diagnostic Log and Trace
 
 Build and Test status: [![build and test status](https://travis-ci.org/GENIVI/dlt-daemon.svg?branch=master)](https://travis-ci.org/GENIVI/dlt-daemon)
+Alerts: [![Total alerts](https://img.shields.io/lgtm/alerts/g/GENIVI/dlt-daemon.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/GENIVI/dlt-daemon/alerts/)
+Code quality: [![Language grade: C/C++](https://img.shields.io/lgtm/grade/cpp/g/GENIVI/dlt-daemon.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/GENIVI/dlt-daemon/context:cpp)
 
 ## Overview