Add adapter file format

docs/genai/reference/adapter.md

@@ -0,0 +1,64 @@
+---
+title: Adapter file spec
+description: Specification for the .onnx_adapter file format
+has_children: false
+parent: Reference
+grand_parent: Generate API (Preview)
+nav_order: 1
+---
+
+# Adapter file specification
+
+
+## File format
+
+The adapter file format is flatbuffers
+
+## File extension
+
+The file extension is ".onnx_adapter"
+
+## Schema
+
+The schema for the file is as follows
+
+```
+File:= 
+  format_version := integer
+  adapter_version := integer
+  model_version := integer
+  [parameter := Parameter]
+```
+
+```
+Parameter:=
+  name := string
+  dimensions := [int64]
+  data_type := TensorDataType
+  [data := uint8] 
+```
+
+```
+TensorDataType:= 
+  UNDEFINED = 0 |
+  FLOAT = 1 |
+  UINT8 = 2 |
+  INT8 = 3 |
+  UINT16 = 4 |
+  INT16 = 5 |
+  INT32 = 6 |
+  INT64 = 7 |
+  STRING = 8 |
+  BOOL = 9 | 
+  FLOAT16 = 10 |
+  DOUBLE = 11 |
+  UINT32 = 12 |
+  UINT64 = 13 |
+  COMPLEX64 = 14 |
+  COMPLEX128 = 15 |
+  BFLOAT16 = 16 |
+  FLOAT8E4M3FN = 17 |
+  FLOAT8E4M3FNUZ = 18 |
+  FLOAT8E5M2 = 19 |
+  FLOAT8E5M2FNUZ = 20
+```