Add a Getting Started guide to CKW README

Resolves: COMPMID-6299

Change-Id: I3b9c464e8cdc6c081472ec0aa6b738c7ccb18b49
Signed-off-by: Jakub Sujak <jakub.sujak@arm.com>
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9759
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gian Marco Iodice <gianmarco.iodice@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/SConstruct b/SConstruct
index e3bb68f..03b0f91 100644
--- a/SConstruct
+++ b/SConstruct
@@ -432,7 +432,7 @@
     CKW_INCLUDE_DIR = CKW_PROJECT_DIR + "/include"
     CKW_BUILD_DIR = build_path.replace("#", "")
 
-    CKW_CMAKE_CMD = "CC={CKW_CC} CXX={CKW_CXX} cmake -G \"Unix Makefiles\" --clean-first " \
+    CKW_CMAKE_CMD = "CC={CKW_CC} CXX={CKW_CXX} cmake -G \"Unix Makefiles\" " \
                     "-S {CKW_PROJECT_DIR} -B {CKW_BUILD_DIR} " \
                     "-DCMAKE_BUILD_TYPE={CKW_BUILD_TYPE} " \
                     "-DCKW_ENABLE_OPENCL={CKW_ENABLE_OPENCL} " \