Update README.md

Author: AgrMayank

README.md

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 # Arduino/NodeMCU/IoT Projects
 > A list of mini projects based on Arduino, NodeMCU and variety of IoT sensors. 
 
+![GitHub issues](https://img.shields.io/github/issues/AgrMayank/Arduino-NodeMCU-IoT-Projects?label=Issues&style=flat-square)
+![GitHub pull requests](https://img.shields.io/github/issues-pr/AgrMayank/Arduino-NodeMCU-IoT-Projects?label=Pull%20Requests&style=flat-square)
+![GitHub last commit](https://img.shields.io/github/last-commit/AgrMayank/Arduino-NodeMCU-IoT-Projects?label=Last%20Commit&style=flat-square)
+![GitHub commit activity](https://img.shields.io/github/commit-activity/m/AgrMayank/Arduino-NodeMCU-IoT-Projects?label=Commit%20Activity&style=flat-square)
+![GitHub repo size](https://img.shields.io/github/repo-size/AgrMayank/Arduino-NodeMCU-IoT-Projects?label=Repo%20Size&style=flat-square)
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 # Quickstart
 > Download [Arduino IDE](https://www.arduino.cc/en/Main/Software).