Add @deprecated tag when applicable

Author: gcatanese

templates/typescript/model.mustache

@@ -16,7 +16,20 @@ export class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{
 {{#description}}
     /**
     * {{{.}}}
+    {{#deprecated}}
+    *
+    * @deprecated since v{{#vendorExtensions.x-deprecatedInVersion}}{{.}}{{/vendorExtensions.x-deprecatedInVersion}}
+    * {{#vendorExtensions.x-deprecatedMessage}}{{..}}{{/vendorExtensions.x-deprecatedMessage}}
+    {{/deprecated}}
     */
+{{/description}}
+{{^description}}
+    {{#deprecated}}
+    /**
+    * @deprecated since v{{#vendorExtensions.x-deprecatedInVersion}}{{.}}{{/vendorExtensions.x-deprecatedInVersion}}
+    * {{#vendorExtensions.x-deprecatedMessage}}{{..}}{{/vendorExtensions.x-deprecatedMessage}}
+    */
+    {{/deprecated}}
 {{/description}}
     '{{name}}'{{^required}}?{{/required}}: {{#isEnum}}{{{datatypeWithEnum}}}{{/isEnum}}{{^isEnum}}{{{dataType}}}{{/isEnum}}{{#isNullable}} | null{{/isNullable}};
 {{/vars}}