gitignore: add from hlsdk-xash3d

.gitignore

@@ -0,0 +1,26 @@
+# Binaries
+*.o
+*.so
+*/*.o
+*/*/*.o
+*.a
+*.framework
+*.exe
+*.dll
+*.pdb
+build/
+CMakeLists.txt.user
+cmake_install.cmake
+*.orig
+*.cbp
+*.dsw
+*.vsxproj
+*.vsproj
+*.sln
+.waf-*
+waf-*
+.waf3-*
+waf3-*
+.lock*
+*.pyc
+.vscode/