Initial checkin of TOSA reference_model and tests

Change-Id: I2f8e7fa63e2ae40203e57d2cc8814bde3b312cb6
Signed-off-by: Eric Kunze <eric.kunze@arm.com>
diff --git a/reference_model/src/ops/custom.h b/reference_model/src/ops/custom.h
new file mode 100644
index 0000000..b1085a5
--- /dev/null
+++ b/reference_model/src/ops/custom.h
@@ -0,0 +1,38 @@
+
+// Copyright (c) 2020, ARM Limited.
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//         http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+
+#ifndef OPS_CUSTOM_H
+#define OPS_CUSTOM_H
+
+#include "graph_node.h"
+
+using namespace tosa;
+
+namespace TosaReference
+{
+
+class OpCustom : public GraphNode
+{
+public:
+    OpCustom(uint64_t id_);
+    virtual ~OpCustom();
+
+    virtual int checkTensorAttributes();
+    virtual int eval();
+};
+
+};    // namespace TosaReference
+
+#endif