refactor: remove .DS_Store and add to .gitignore (#8)

Removed the .DS_Store file, accidentally was omitted from the .gitignore
file.

.gitignore

@@ -396,3 +396,30 @@ FodyWeavers.xsd
 
 # JetBrains Rider
 *.sln.iml
+
+# Common IntelliJ Platform excludes
+
+# User specific
+.idea/**/workspace.xml
+**/.idea/**/workspace.xml
+**/.idea/**/tasks.xml
+**/.idea/shelf/*
+**/.idea/dictionaries
+**/.idea/httpRequests/
+
+# Sensitive or high-churn files
+**/.idea/**/dataSources/
+**/.idea/**/dataSources.ids
+**/.idea/**/dataSources.xml
+**/.idea/**/dataSources.local.xml
+**/.idea/**/sqlDataSources.xml
+**/.idea/**/dynamic.xml
+
+# Rider
+# Rider auto-generates .iml files, and contentModel.xml
+**/.idea/**/*.iml
+**/.idea/**/contentModel.xml
+**/.idea/**/modules.xml
+
+# Mac stuff
+.DS_Store