doc/tutorial/basics: add basics tutorial
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+[TOC](Readme.md) [Prev](fold.md) [Next](comments.md)
+
+# Folding all Fields
+
+This also works if a struct has more than one member.
+
+In general, any JSON configuration can be expressed as a collection of
+path-leaf pairs without using any curly braces.
+
+<!-- CUE editor -->
+```
+outer middle1 inner: 3
+outer middle2 inner: 7
+```
+
+<!-- JSON result -->
+```json
+"outer": {
+ "middle1": {
+ "inner": 3
+ },
+ "middle2": {
+ "inner": 7
+ }
+}
+```
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