doc/tutorial/basics: add basics tutorial
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+[TOC](Readme.md) [Prev](operators.md) [Next](interpolfield.md)
+
+# Interpolation
+
+String and bytes literals support interpolation.
+
+Any valid CUE expression may be used inside the escaped parentheses.
+Interpolation may also be used in multiline string and byte literals.
+
+<!-- CUE editor -->
+```
+"You are \( cost - budget ) dollars over budget!"
+
+cost: 102
+budget: 88
+```
+
+<!-- result -->
+```
+"You are 14 dollars over budget!"
+```
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