feat: readme and randomstring example

README.md

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+# util-utils
+
+`util-utils` means "útil" (useful in spanish) + utils (utilities).
+
+This package is a zero-dependency everyday utility library for lazy Javascript developers.
+
+# Features
+
+Will be worked on progressively, but for now:
+
+- [randomstring](https://github.com/SrIzan10/util-utils/tree/main/examples/randomstring.ts)

examples/randomstring.ts

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+import { randomString } from "../src/index.ts";
+
+console.log(randomString(10));
+// => (random 10-character string)