doc/tutorial/basics: add basics tutorial
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+[TOC](Readme.md) [Prev](curly.md) [Next](foldany.md)
+
+# Folding of Single-Field Structs
+
+CUE allows a shorthand for structs with single members.
+
+<!-- CUE editor -->
+```
+outer middle inner: 3
+```
+
+<!-- JSON result -->
+```json
+"outer": {
+ "middle": {
+ "inner": 3
+ }
+}
+```
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