Set severity for IDE0005 to warning and add doc file

Author: Noblix

distribution/dotnet7/.editorconfig

@@ -463,6 +463,7 @@ dotnet_diagnostic.CA1014.severity = none            # https://github.com/atc-net
 dotnet_diagnostic.CA1068.severity = error           # https://github.com/atc-net/atc-coding-rules/blob/main/documentation/CodeAnalyzersRules/MicrosoftCodeAnalysis/CA1068.md
 dotnet_diagnostic.CA1707.severity = error           # https://github.com/atc-net/atc-coding-rules/blob/main/documentation/CodeAnalyzersRules/MicrosoftCodeAnalysis/CA1707.md
 dotnet_diagnostic.CA2007.severity = suggestion      # https://github.com/atc-net/atc-coding-rules/blob/main/documentation/CodeAnalyzersRules/MicrosoftCodeAnalysis/CA2007.md
+dotnet_diagnostic.IDE0005.severity = warning        # https://github.com/atc-net/atc-coding-rules/blob/main/documentation/CodeAnalyzersRules/MicrosoftCodeAnalysis/IDE0005.md
 dotnet_diagnostic.IDE0058.severity = none           # https://github.com/atc-net/atc-coding-rules/blob/main/documentation/CodeAnalyzersRules/MicrosoftCodeAnalysis/IDE0058.md
 
 

documentation/CodeAnalyzersRules/MicrosoftCodeAnalysis/IDE0005.md

@@ -0,0 +1,21 @@
+# Rule adding suggestion - Decision
+
+### Rule summary
+
+|             | Value |
+| ----------- |------------------------------------------------|
+| Title       | IDE0005 Remove unnecessary using directives |
+| CheckId     | IDE0005 |
+| Category    | Style |
+| Link        | https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/style-rules/ide0005 |
+
+### What is the problem
+This rule detects unused usings which can simply be removed. This rule is currently not a part of our coding rules and it should be.
+
+### Decision
+
+We update the `root/.editorconfig` with `severity = warning` and a doc-link.
+
+### Reason & arguments
+
+* This rule detects code that can be removed and no code is better than no code - see dissuction in [Issue #74](https://github.com/atc-net/atc-coding-rules/issues/74).