添加.gitignore文件，忽略bin和obj目录

.gitignore

@@ -0,0 +1,41 @@
+# Visual Studio files
+.vs/
+*.user
+*.userosscache
+*.sln.docstates
+
+# Build results
+[Dd]ebug/
+[Rr]elease/
+x64/
+x86/
+[Aa][Rr][Mm]/
+[Aa][Rr][Mm]64/
+bld/
+[Bb]in/
+[Oo]bj/
+
+# Visual Studio cache/options directory
+.vs/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# .NET Core
+project.lock.json
+project.fragment.lock.json
+artifacts/
+
+# Visual Studio Code
+.vscode/
+
+# Rider
+.idea/
+
+# User-specific files
+*.rsuser
+*.suo
+*.user
+*.userosscache
+*.sln.docstates