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/BuiltinOperator.py b/ethosu/vela/tflite/BuiltinOperator.py
new file mode 100644
index 0000000..2713653
--- /dev/null
+++ b/ethosu/vela/tflite/BuiltinOperator.py
@@ -0,0 +1,131 @@
+# automatically generated by the FlatBuffers compiler, do not modify
+
+# namespace: tflite
+
+class BuiltinOperator(object):
+    ADD = 0
+    AVERAGE_POOL_2D = 1
+    CONCATENATION = 2
+    CONV_2D = 3
+    DEPTHWISE_CONV_2D = 4
+    DEPTH_TO_SPACE = 5
+    DEQUANTIZE = 6
+    EMBEDDING_LOOKUP = 7
+    FLOOR = 8
+    FULLY_CONNECTED = 9
+    HASHTABLE_LOOKUP = 10
+    L2_NORMALIZATION = 11
+    L2_POOL_2D = 12
+    LOCAL_RESPONSE_NORMALIZATION = 13
+    LOGISTIC = 14
+    LSH_PROJECTION = 15
+    LSTM = 16
+    MAX_POOL_2D = 17
+    MUL = 18
+    RELU = 19
+    RELU_N1_TO_1 = 20
+    RELU6 = 21
+    RESHAPE = 22
+    RESIZE_BILINEAR = 23
+    RNN = 24
+    SOFTMAX = 25
+    SPACE_TO_DEPTH = 26
+    SVDF = 27
+    TANH = 28
+    CONCAT_EMBEDDINGS = 29
+    SKIP_GRAM = 30
+    CALL = 31
+    CUSTOM = 32
+    EMBEDDING_LOOKUP_SPARSE = 33
+    PAD = 34
+    UNIDIRECTIONAL_SEQUENCE_RNN = 35
+    GATHER = 36
+    BATCH_TO_SPACE_ND = 37
+    SPACE_TO_BATCH_ND = 38
+    TRANSPOSE = 39
+    MEAN = 40
+    SUB = 41
+    DIV = 42
+    SQUEEZE = 43
+    UNIDIRECTIONAL_SEQUENCE_LSTM = 44
+    STRIDED_SLICE = 45
+    BIDIRECTIONAL_SEQUENCE_RNN = 46
+    EXP = 47
+    TOPK_V2 = 48
+    SPLIT = 49
+    LOG_SOFTMAX = 50
+    DELEGATE = 51
+    BIDIRECTIONAL_SEQUENCE_LSTM = 52
+    CAST = 53
+    PRELU = 54
+    MAXIMUM = 55
+    ARG_MAX = 56
+    MINIMUM = 57
+    LESS = 58
+    NEG = 59
+    PADV2 = 60
+    GREATER = 61
+    GREATER_EQUAL = 62
+    LESS_EQUAL = 63
+    SELECT = 64
+    SLICE = 65
+    SIN = 66
+    TRANSPOSE_CONV = 67
+    SPARSE_TO_DENSE = 68
+    TILE = 69
+    EXPAND_DIMS = 70
+    EQUAL = 71
+    NOT_EQUAL = 72
+    LOG = 73
+    SUM = 74
+    SQRT = 75
+    RSQRT = 76
+    SHAPE = 77
+    POW = 78
+    ARG_MIN = 79
+    FAKE_QUANT = 80
+    REDUCE_PROD = 81
+    REDUCE_MAX = 82
+    PACK = 83
+    LOGICAL_OR = 84
+    ONE_HOT = 85
+    LOGICAL_AND = 86
+    LOGICAL_NOT = 87
+    UNPACK = 88
+    REDUCE_MIN = 89
+    FLOOR_DIV = 90
+    REDUCE_ANY = 91
+    SQUARE = 92
+    ZEROS_LIKE = 93
+    FILL = 94
+    FLOOR_MOD = 95
+    RANGE = 96
+    RESIZE_NEAREST_NEIGHBOR = 97
+    LEAKY_RELU = 98
+    SQUARED_DIFFERENCE = 99
+    MIRROR_PAD = 100
+    ABS = 101
+    SPLIT_V = 102
+    UNIQUE = 103
+    CEIL = 104
+    REVERSE_V2 = 105
+    ADD_N = 106
+    GATHER_ND = 107
+    COS = 108
+    WHERE = 109
+    RANK = 110
+    ELU = 111
+    REVERSE_SEQUENCE = 112
+    MATRIX_DIAG = 113
+    QUANTIZE = 114
+    MATRIX_SET_DIAG = 115
+    ROUND = 116
+    HARD_SWISH = 117
+    IF = 118
+    WHILE = 119
+    NON_MAX_SUPPRESSION_V4 = 120
+    NON_MAX_SUPPRESSION_V5 = 121
+    SCATTER_ND = 122
+    SELECT_V2 = 123
+    DENSIFY = 124
+    SEGMENT_SUM = 125