[api-draft][doc] move Assert.md to docs/en/new-connector

docs/en/new-connector/sink/Assert.md

@@ -0,0 +1,94 @@
+# Assert
+
+## Description
+
+A flink sink plugin which can assert illegal data by user defined rules
+
+## Options
+
+| name                          | type        | required | default value |
+| ----------------------------- | ----------  | -------- | ------------- |
+|rules                          | ConfigList  | yes      | -             |
+|rules.field_name               | string      | yes      | -             |
+|rules.field_type               | string      | no       | -             |
+|rules.field_value              | ConfigList  | no       | -             |
+|rules.field_value.rule_type    | string      | no       | -             |
+|rules.field_value.rule_value   | double      | no       | -             |
+
+
+### rules [ConfigList]
+
+Rule definition of user's available data.  Each rule represents one field validation.
+
+### field_name [string]
+
+field name（string）
+
+### field_type [string]
+
+field type (string),  e.g. `string,boolean,byte,short,int,long,float,double,char,void,BigInteger,BigDecimal,Instant`
+
+### field_value [ConfigList]
+
+A list value rule define the data value validation
+
+### rule_type [string]
+
+The following rules are supported for now
+`
+NOT_NULL,   // value can't be null
+MIN,        // define the minimum value of data
+MAX,        // define the maximum value of data
+MIN_LENGTH, // define the minimum string length of a string data
+MAX_LENGTH  // define the maximum string length of a string data
+`
+
+### rule_value [double]
+
+the value related to rule type
+
+
+## Example
+the whole config obey with `hocon` style
+
+```hocon
+Assert {
+    rules = 
+        [{
+            field_name = name
+            field_type = string
+            field_value = [
+                {
+                    rule_type = NOT_NULL
+                },
+                {
+                    rule_type = MIN_LENGTH
+                    rule_value = 3
+                },
+                {
+                     rule_type = MAX_LENGTH
+                     rule_value = 5
+                }
+            ]
+        },{
+            field_name = age
+            field_type = int
+            field_value = [
+                {
+                    rule_type = NOT_NULL
+                },
+                {
+                    rule_type = MIN
+                    rule_value = 10
+                },
+                {
+                     rule_type = MAX
+                     rule_value = 20
+                }
+            ]
+        }
+        ]
+
+}
+
+```