add lldap graphql query

docs/How-to/LLDAP_Graphql.md

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+# LLDAP Graphql query
+
+URL: /api/graphql/playground
+
+set HTTP HEADER
+{ "Authorization": "Bearer token"}
+
+## Get User
+
+```Graphql
+{
+  user(userId: "admin"){
+    id
+    attributes {name,value}
+    groups{id}
+  }
+}
+
+```
+
+## updateUserAttribute
+
+```Graphql
+mutation { updateUser(
+  				user:{
+            id:"admin"
+            insertAttributes:{
+              name:"toto"
+            	value:"test"
+            }
+          }
+					){
+		  	ok
+  }
+}
+```
+
+## add User attribute
+
+```Graphql
+
+mutation { addUserAttribute(
+    name:"toto"
+    attributeType:STRING
+    isList:true
+    isVisible:true
+    isEditable:true){
+        ok
+  }
+}
+```
+
+## delete user attribute
+
+```graphql
+mutation {
+  deleteUserAttribute(name: "toto") {
+    ok
+  }
+}
+```