Add build directory

build/README.md

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+# build
+
+The directory is used to build a single file `noble-ciphers.js` which contains everything.
+
+The output file uses iife wrapper and can be used in browsers as-is.
+
+Don't use it unless you can't use NPM/ESM, which support tree shaking.

build/input.js

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+export {
+  salsa20, xsalsa20_poly1305,
+  chacha20, chacha8, chacha12,
+  chacha20_poly1305, xchacha20_poly1305,
+} from '@noble/ciphers/_slow';
+import { bytesToHex, bytesToUtf8, hexToBytes, utf8ToBytes } from '@noble/ciphers/utils';
+export const utils = { bytesToHex, bytesToUtf8, hexToBytes, utf8ToBytes };