Add WIP status badge

Author: ajsb85

README.md

@@ -1,6 +1,7 @@
 Firechip Quectel EG25-G Arduino Library
 ==============================
 
+[![Project Status: WIP – Initial development is in progress, but there has not yet been a stable, usable release suitable for the public.](https://www.repostatus.org/badges/latest/wip.svg)](https://www.repostatus.org/#wip)
 [![Report Size Deltas](https://github.com/firechip/Firechip_Quectel_EG25-G_Arduino_Library/actions/workflows/report-size-deltas.yml/badge.svg)](https://github.com/firechip/Firechip_Quectel_EG25-G_Arduino_Library/actions/workflows/report-size-deltas.yml)
 [![Compile Examples](https://github.com/firechip/Firechip_Quectel_EG25-G_Arduino_Library/actions/workflows/compile-examples.yml/badge.svg)](https://github.com/firechip/Firechip_Quectel_EG25-G_Arduino_Library/actions/workflows/compile-examples.yml)
 [![CodeQL](https://github.com/firechip/Firechip_Quectel_EG25-G_Arduino_Library/actions/workflows/codeql.yml/badge.svg)](https://github.com/firechip/Firechip_Quectel_EG25-G_Arduino_Library/actions/workflows/codeql.yml)