removed .hgignore file

csharp/.hgignore

@@ -1,23 +0,0 @@
-syntax: glob
-
-build_output/
-build_temp/
-bin/
-obj/
-*.cache
-_ReSharper.*
-*.user
-*.suo
-*.bat
-*.zip
-*.DotSettings
-build/*.log
-BenchmarkResults.txt
-
-lib/NUnit/tools/nunit-console.exe.config
-
-syntax: regexp
-build/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,5}/
-
-# Ignore Roslyn files
-^src/.*\.sln\.ide/