Add Vela codebase

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

Change-Id: I3690f8c8f5966306ecddaeb2793c30ca9c6e2eee
diff --git a/ethosu/vela/model_reader.py b/ethosu/vela/model_reader.py
new file mode 100644
index 0000000..6d7a3a4
--- /dev/null
+++ b/ethosu/vela/model_reader.py
@@ -0,0 +1,45 @@
+# 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.
+
+
+# Description:
+# Dispatcher for reading a neural network model.
+
+
+class ModelReaderOptions:
+    def __init__(self, batch_size=1):
+        self.batch_size = batch_size
+
+    def __str__(self):
+        return type(self).__name__ + ": " + str(self.__dict__)
+
+    __repr__ = __str__
+
+
+def read_model(fname, options, feed_dict={}, output_node_names=[], initialisation_nodes=[]):
+    if fname.endswith(".tflite"):
+        from . import tflite_reader
+
+        nng = tflite_reader.read_tflite(
+            fname,
+            options.batch_size,
+            feed_dict=feed_dict,
+            output_node_names=output_node_names,
+            initialisation_nodes=initialisation_nodes,
+        )
+    else:
+        assert 0, "Unknown model format"
+    return nng