doc/tutorial/basics: add basics tutorial
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+[TOC](Readme.md) [Prev](json.md) [Next](commas.md)
+
+# Quotes are Optional for Field Names
+
+JSON objects are called structs in CUE.
+An object member is called a field.
+
+
+Double quotes may be omitted from field names if their name contains no
+special characters and does not start with a number:
+
+<!-- CUE editor -->
+```
+{
+ one: 1,
+ two: 2,
+ "two-and-a-half": 2.5
+}
+```
+
+<!-- JSON result -->
+```json
+{
+ "one": 1,
+ "two": 2,
+ "two-and-a-half": 2.5
+}
+```
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