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/tflite/QuantizationDetails.py b/ethosu/vela/tflite/QuantizationDetails.py
new file mode 100644
index 0000000..8d53af9
--- /dev/null
+++ b/ethosu/vela/tflite/QuantizationDetails.py
@@ -0,0 +1,7 @@
+# automatically generated by the FlatBuffers compiler, do not modify
+
+# namespace: tflite
+
+class QuantizationDetails(object):
+    NONE = 0
+    CustomQuantization = 1