📚 docs(README): Add examples block.

README.md

@@ -11,6 +11,25 @@ See [docs](https://set-theory.github.io/cartesian-product/index.html).
 > `regeneratorRuntime` to be defined, for instance by importing
 > [regenerator-runtime/runtime](https://www.npmjs.com/package/regenerator-runtime).
 
+```js
+import { product } from '@set-theory/cartesian-product' ;
+product( [ "ABCD" , "xy" ] , 1 ) ; // Ax Ay Bx By Cx Cy Dx Dy
+
+import { range } from '@aureooms/js-itertools' ;
+product( [ range( 2 ) ] , 3 ) ; // 000 001 010 011 100 101 110 111
+
+product( [ range( 4 ) , range( 4 ) ] ) ; // 00 01 02 03 10 11 12 13 20 21 ...
+
+import { diagonal } from '@set-theory/cartesian-product' ;
+diagonal( range( 4 ) , range( 4 ) ) ; // 00 01 10 02 11 20 03 12 21 30 ...
+
+import { count } from '@aureooms/js-itertools' ;
+product( [count( ), count( )] ) ; // Loops forever without yielding. DO NOT DO THIS
+diagonal( count( ), count( ) ) ; // 00 01 10 02 11 20 03 12 21 30 ...
+import { _product } from '@set-theory/cartesian-product' ;
+_product( [count( ), count( )], 0, 2 ) ; // 00 01 02 03 04 05 06 07 08 09 ...
+```
+
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