Add a README

Author: pdl

README.md

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+# regexp-capture-interpolation
+
+Interpolate regular expression captures and match variables (i.e. `$1`, `$&`) into a replacement string.
+
+# Usage
+
+```js
+var Interpolation = require('regexp-capture-interpolation');
+
+Interpolation.interpolate(
+  ['key\tvalue', 'key', 'value', 0, 'key\tvalue\n'],
+  '$1: $2,'
+); // returns "key: value,"
+```
+