[feat]添加分享示例

docs/api/share-with-system.md

+## uni.shareWithSystem(options) @sharewithsystem
+
+<!-- UTSAPIJSON.shareWithSystem.description -->
+
+<!-- UTSAPIJSON.shareWithSystem.compatibility -->
+
+<!-- UTSAPIJSON.shareWithSystem.param -->
+
+<!-- UTSAPIJSON.shareWithSystem.returnValue -->
+
+<!-- UTSAPIJSON.shareWithSystem.example -->
+
+<!-- UTSAPIJSON.shareWithSystem.tutorial -->
+
+<!-- UTSAPIJSON.shareWithSystem.example -->
+
+<!-- UTSAPIJSON.general_type.name -->
+
+<!-- UTSAPIJSON.general_type.param -->
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