Add kernel and kernel writer skeletons

* Add the skeleton for kernel, kernel writer and their respective
  OpenCL implementation.
* Add method to write code comment and its test.

Resolves: COMPMID-6343
Signed-off-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Change-Id: Ib986228154f7a00da7a5fd3b7105941325fe13b1
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9889
Tested-by: Arm Jenkins <bsgcomp@arm.com>
Reviewed-by: Gunes Bayir <gunes.bayir@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
diff --git a/compute_kernel_writer/include/ckw/Kernel.h b/compute_kernel_writer/include/ckw/Kernel.h
new file mode 100644
index 0000000..0cab713
--- /dev/null
+++ b/compute_kernel_writer/include/ckw/Kernel.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2023 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef CKW_INCLUDE_CKW_KERNEL_H
+#define CKW_INCLUDE_CKW_KERNEL_H
+
+#include "ckw/types/TargetLanguage.h"
+#include <string>
+
+namespace ckw
+{
+
+/** The kernel that has been emitted by the kernel writer.
+ *
+ * It contains all the necessary information to compile and execute the kernel.
+ */
+class Kernel
+{
+public:
+    /** Initialize a new instance of @ref Kernel class with all emitted kernel information.
+     *
+     * @param[in] language    The target language of the kernel.
+     * @param[in] source_code The source code of the kernel.
+     */
+    Kernel(TargetLanguage language, const std::string &source_code);
+
+    /** Get the target language. */
+    TargetLanguage target_language() const;
+
+    /** Get the source code. */
+    const std::string &source_code() const;
+
+private:
+    TargetLanguage _language;
+    std::string    _source_code;
+};
+
+} // namespace ckw
+
+#endif // CKW_INCLUDE_CKW_KERNEL_H