Add CMakeLists to Compute Kernel Writer

Resolves: COMPMID-6276

Change-Id: Id6d6d8c1a92cf2b11c1240e044d31f386fbda61e
Signed-off-by: Jakub Sujak <jakub.sujak@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9700
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/.gitignore b/.gitignore
index ac38812..bea1f8e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
 # Library builds
 build/
 bazel-*
+compute_kernel_writer/build/
+compute_kernel_writer/cmake-build*
 
 # Cscope/Ctags files
 *cscope*