Add Vela codebase

 - Added modules ethosu.vela and ethosu.mlw_codec.
 - Added README and various configuration files.

Change-Id: I3690f8c8f5966306ecddaeb2793c30ca9c6e2eee
diff --git a/ethosu/mlw_codec/test_mlw_codec.py b/ethosu/mlw_codec/test_mlw_codec.py
new file mode 100644
index 0000000..b868721
--- /dev/null
+++ b/ethosu/mlw_codec/test_mlw_codec.py
@@ -0,0 +1,43 @@
+#!/usr/bin/env python3
+
+# Copyright (C) 2020 Arm Limited or its affiliates. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+# 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
+#
+# 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.
+
+
+# Simple example of the usage of mlw_codec.
+
+import sys
+
+from ethosu import mlw_codec
+
+
+# Simple example
+if __name__ == "__main__":
+    weights = [0, 2, 3, 0, -1, -2, -3, 0, 0, 0, 1, -250, 240] * 3
+    print("Original weights    :", weights)
+
+    compressed_weights = mlw_codec.encode(weights)
+    print("Compressed weights  :", len(compressed_weights), compressed_weights)
+
+    uncompressed_weights = mlw_codec.decode(compressed_weights)
+    print("Uncompressed weights:", uncompressed_weights)
+
+    if weights != uncompressed_weights:
+        print("TEST FAILED")
+        sys.exit(1)
+    else:
+        print("TEST PASSED")
+        sys.exit(0)