Add additional temporary files to .gitignore

Adding a few more temporary files to .gitignore,
to make it easier to work within an IDE.
The .vscode file is already present,
so there is precedent for adding IDE files here.

Signed-off-by: Josh Lehan <krellan@google.com>
Change-Id: Ic5324a1e5df91a5861b0fca53d33a7c4e7723314
diff --git a/.gitignore b/.gitignore
index fb4aef4..1f601f0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /build*
+.idea/
 .vscode
 3rdparty/
 CMakeCache.txt
@@ -6,6 +7,7 @@
 CTestTestfile.cmake
 Makefile
 Testing/
+cmake-build-debug/
 cmake_install.cmake
 compile_commands.json
 googletest-build/