docs: add TPS26750 to See Also cross-links

Author: theohg

README.md

@@ -207,6 +207,7 @@ void app_init() {
 
 - [DRV8214 Multiplatform](https://github.com/theohg/drv8214_multiplatform)
 - [BQ25756E Multiplatform](https://github.com/theohg/bq25756e_multiplatform)
+- [TPS26750 Multiplatform](https://github.com/theohg/tps26750_multiplatform)
 
 ## License