add test data

tools/matmul_testdata/matmul_vectors.json

@@ -0,0 +1,19 @@
+{
+  "groups": 10,
+  "seed": 1,
+  "max_value": 4294967295,
+  "zero_matrix_group": 0,
+  "memory_bytes": 4194304,
+  "memory_words": 1048576,
+  "max_groups_for_memory": 13107,
+  "source_words": 320,
+  "result_words": 480,
+  "src_base_offset": 0,
+  "dst_base_offset": 1280,
+  "unused_tail_words": 1047776,
+  "bytes_per_source_group": 128,
+  "bytes_per_result_group": 192,
+  "input_image": "source region filled, result region and unused tail filled with 0",
+  "expected_image": "source region preserved, result region filled, unused tail filled with 0",
+  "layout": "A0,B0,A1,B1,...,A(n-1),B(n-1),C0,C1,...,C(n-1),zero padding"
+}