add export func reame

添加函数支持

doc/func.md

@@ -0,0 +1,56 @@
+# func export readme
+- Note: the shortcut function is only an auxiliary function of Gorm. Currently only query function is supported
+## Catalog
+ - [_BaseMgr](#_BaseMgr)
+	- [_BaseMgr](#_BaseMgr)
+	- [SetCtx](#SetCtx)
+	- [GetDB](#GetDB)
+	- [GetIsRelated](#GetIsRelated)
+	- [SetIsRelated](#SetIsRelated)
+ - [Table logic function](#Table-logic-function)
+ 	- [Brief description](#Brief-description)
+    - [Basic types of logic]](#Basic-types-of-logic)
+    - [Access to existing conditions](#Access-to-existing-conditions)
+    - [Access to function options](#Access-to-function-options)
+    - [Single element access](#Single-element-access)
+    - [Index access](#Index-access)
+
+## _BaseMgr
+   Basic function. All management types inherit this function. This function provides the underlying common function.
+### SetCtx 
+    Set context, which is used to set context. The current function is not enabled
+### GetDB
+    Get gorm.db original link
+### GetIsRelated
+    Get whether to query foreign key Association
+### SetIsRelated
+    Set whether to query foreign key Association
+
+## Table logic function
+    Table logical function operation about database table related function: use [XXX] to represent logical table structure name
+### Brief description
+    Queries are divided into the following categories
+### Basic types of logic
+    `_[xxx]Mgr` : Logical table type
+### Access to existing conditions
+    `Get/Gets` : Batch get (you can use gormt to get the final result using its preset conditions)
+
+### Access to function options
+
+    This function is used to support multiple condition acquisition
+
+    `GetByOption/GetByOptions` : Get function option list
+    `With[xxx]` : Parameter list in function options
+
+### Single element access
+
+    `GetFrom[xxx]` : Element acquisition (single case conditional acquisition)
+
+    `GetBatchFrom[xxx]` : Batch element acquisition (array acquisition of a single condition) 
+
+### Index access
+
+    `FetchByPrimaryKey` : Primary key acquisition
+    `FetchByUnique` : Get by unique index
+    `FetchBy[xxx]Index` : Composite index fetch (multiple returned)
+    `FetchBy[xxx]UniqueIndex` : Unique composite index fetch (return one)