Adding .gitignore for IAR EWARM IDE (https://www.iar.com/iar-embedded-workbench/)

IAR_EWARM.gitignore

+# All build-directories inside an EWARM subdirectory
+# EWARM will put its build files under a subdirectory
+# with the same name as the configuration.
+# Example
+# EWARM/Config1/Obj /List /Exe
+# EWARM/Config2/Obj /List /Exe
+EWARM/**/Obj
+EWARM/**/List
+EWARM/**/Exe
+
+# Autogenerated project files 
+*.dep
+*.ewt
+
+# Autogenerated folder for debugger
+EWARM/settings