Extend .gitignore file to exclude IDE folders

Exluding the following:
 - .idea/
 - .vscode/

Change-Id: I3619c61accbdb1185f61994872a2b855e4af405f
Signed-off-by: Georgios Pinitas <georgios.pinitas@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/5228
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Michele Di Giorgio <michele.digiorgio@arm.com>
diff --git a/.gitignore b/.gitignore
index 85c6e00..e917c49 100644
--- a/.gitignore
+++ b/.gitignore
@@ -45,3 +45,7 @@
 env/
 venv/
 ENV/
+
+# IDE folders
+.idea/
+.vscode/