Merge pull request #1468 from alex-semenyuk/map_example

Add map example to Tezos docs

docs/tutorials/custom_contracts/tezos.md

@@ -105,6 +105,7 @@ The `details` field is used to encapsulate blockchain specific type information
 - variant
 - list
 - struct
+- map
 
 #### Internal type vs Internal schema
 
@@ -203,6 +204,29 @@ The `details` field is used to encapsulate blockchain specific type information
 }
 ```
 
+<i>Map example:</i>
+
+``` json
+{
+    "details": {
+        "type": "schema",
+        "internalSchema": {
+            "type": "map",
+            "args": [
+                {
+                    "name": "key",
+                    "type": "integer"
+                },
+                {
+                    "name": "value",
+                    "type": "string"
+                }
+            ]
+        }
+    }
+}
+```
+
 #### Options
 
 <i>Option</i> type is used to indicate a value as optional (see more at [smartpy options](https://smartpy.io/manual/syntax/options-and-variants#options))
@@ -665,4 +689,4 @@ To make a read-only request to the blockchain to check the current value of the
 }
 ```
 
-> **NOTE:** Some contracts may have queries that require input parameters. That's why the query endpoint is a `POST`, rather than a `GET` so that parameters can be passed as JSON in the request body. This particular function does not have any parameters, so we just pass an empty JSON object.
+> **NOTE:** Some contracts may have queries that require input parameters. That's why the query endpoint is a `POST`, rather than a `GET` so that parameters can be passed as JSON in the request body. This particular function does not have any parameters, so we just pass an empty JSON object.