Introducing Mongoose Guru on Gurubase.io

Signed-off-by: Kursat Aktas <kursat.ce@gmail.com>

README.md

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 [![Build Status]( https://github.com/cesanta/mongoose/workflows/build/badge.svg)](https://github.com/cesanta/mongoose/actions)
 [![Code Coverage](https://codecov.io/gh/cesanta/mongoose/branch/master/graph/badge.svg)](https://codecov.io/gh/cesanta/mongoose)
 [![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/mongoose.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:mongoose)
+[![Gurubase](https://img.shields.io/badge/Gurubase-Ask%20Mongoose%20Guru-006BFF)](https://gurubase.io/g/mongoose)
 
 Mongoose is a network library for C/C++.  It provides event-driven non-blocking
 APIs for TCP, UDP, HTTP, WebSocket, MQTT, and other protocols.  It is designed