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/BuiltinOptions.py b/ethosu/vela/tflite/BuiltinOptions.py
new file mode 100644
index 0000000..babbcb1
--- /dev/null
+++ b/ethosu/vela/tflite/BuiltinOptions.py
@@ -0,0 +1,106 @@
+# automatically generated by the FlatBuffers compiler, do not modify
+
+# namespace: tflite
+
+class BuiltinOptions(object):
+    NONE = 0
+    Conv2DOptions = 1
+    DepthwiseConv2DOptions = 2
+    ConcatEmbeddingsOptions = 3
+    LSHProjectionOptions = 4
+    Pool2DOptions = 5
+    SVDFOptions = 6
+    RNNOptions = 7
+    FullyConnectedOptions = 8
+    SoftmaxOptions = 9
+    ConcatenationOptions = 10
+    AddOptions = 11
+    L2NormOptions = 12
+    LocalResponseNormalizationOptions = 13
+    LSTMOptions = 14
+    ResizeBilinearOptions = 15
+    CallOptions = 16
+    ReshapeOptions = 17
+    SkipGramOptions = 18
+    SpaceToDepthOptions = 19
+    EmbeddingLookupSparseOptions = 20
+    MulOptions = 21
+    PadOptions = 22
+    GatherOptions = 23
+    BatchToSpaceNDOptions = 24
+    SpaceToBatchNDOptions = 25
+    TransposeOptions = 26
+    ReducerOptions = 27
+    SubOptions = 28
+    DivOptions = 29
+    SqueezeOptions = 30
+    SequenceRNNOptions = 31
+    StridedSliceOptions = 32
+    ExpOptions = 33
+    TopKV2Options = 34
+    SplitOptions = 35
+    LogSoftmaxOptions = 36
+    CastOptions = 37
+    DequantizeOptions = 38
+    MaximumMinimumOptions = 39
+    ArgMaxOptions = 40
+    LessOptions = 41
+    NegOptions = 42
+    PadV2Options = 43
+    GreaterOptions = 44
+    GreaterEqualOptions = 45
+    LessEqualOptions = 46
+    SelectOptions = 47
+    SliceOptions = 48
+    TransposeConvOptions = 49
+    SparseToDenseOptions = 50
+    TileOptions = 51
+    ExpandDimsOptions = 52
+    EqualOptions = 53
+    NotEqualOptions = 54
+    ShapeOptions = 55
+    PowOptions = 56
+    ArgMinOptions = 57
+    FakeQuantOptions = 58
+    PackOptions = 59
+    LogicalOrOptions = 60
+    OneHotOptions = 61
+    LogicalAndOptions = 62
+    LogicalNotOptions = 63
+    UnpackOptions = 64
+    FloorDivOptions = 65
+    SquareOptions = 66
+    ZerosLikeOptions = 67
+    FillOptions = 68
+    BidirectionalSequenceLSTMOptions = 69
+    BidirectionalSequenceRNNOptions = 70
+    UnidirectionalSequenceLSTMOptions = 71
+    FloorModOptions = 72
+    RangeOptions = 73
+    ResizeNearestNeighborOptions = 74
+    LeakyReluOptions = 75
+    SquaredDifferenceOptions = 76
+    MirrorPadOptions = 77
+    AbsOptions = 78
+    SplitVOptions = 79
+    UniqueOptions = 80
+    ReverseV2Options = 81
+    AddNOptions = 82
+    GatherNdOptions = 83
+    CosOptions = 84
+    WhereOptions = 85
+    RankOptions = 86
+    ReverseSequenceOptions = 87
+    MatrixDiagOptions = 88
+    QuantizeOptions = 89
+    MatrixSetDiagOptions = 90
+    HardSwishOptions = 91
+    IfOptions = 92
+    WhileOptions = 93
+    DepthToSpaceOptions = 94
+    NonMaxSuppressionV4Options = 95
+    NonMaxSuppressionV5Options = 96
+    ScatterNdOptions = 97
+    SelectV2Options = 98
+    DensifyOptions = 99
+    SegmentSumOptions = 100