doc/tutorial/basics: add basics tutorial
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+[TOC](Readme.md) [Prev](foldany.md) [Next](numberlit.md)
+
+# Comments
+
+CUE supports C-style block and line comments.
+
+<!-- CUE editor -->
+```
+// whole numbers
+one: 1
+two: 2
+
+/* fractions
+ */
+"two-and-a-half": 2.5
+```
+
+<!-- JSON result -->
+```json
+{
+ "one": 1,
+ "two": 2,
+ "two-and-a-half": 2.5
+}
+```
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