chore: Add a root module (mod.ts) to @std/encoding (#4820)

* Add mod.ts entrypoint for encoding

* Add todo

* Add module docs

* Remove encoding readme

* Add mod.ts to exports

* Fix example

encoding/README.md

@@ -1,9 +0,0 @@
-Utilities for encoding and decoding common formats like hex, base64, and varint.
-
-This module is browser compatible.
-
-```ts
-import { encodeBase64 } from "@std/encoding/base64";
-
-encodeBase64("foobar"); // "Zm9vYmFy"
-```

encoding/deno.json

@@ -2,6 +2,7 @@
   "name": "@std/encoding",
   "version": "0.224.1",
   "exports": {
+    ".": "./mod.ts",
     "./ascii85": "./ascii85.ts",
     "./base32": "./base32.ts",
     "./base58": "./base58.ts",

encoding/mod.ts

@@ -0,0 +1,34 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+/**
+ * Utilities for encoding and decoding common formats like hex, base64, and varint.
+ *
+ * This module is browser compatible.
+ *
+ * ```ts
+ * import { encodeBase64, decodeBase64 } from "@std/encoding";
+ * import { assertEquals } from "@std/assert/assert-equals";
+ *
+ * const foobar = new TextEncoder().encode("foobar");
+ * assertEquals(encodeBase64(foobar), "Zm9vYmFy");
+ * assertEquals(decodeBase64("Zm9vYmFy"), foobar);
+ * ```
+ *
+ * @module
+ */
+
+export * from "./ascii85.ts";
+export * from "./base32.ts";
+export * from "./base58.ts";
+export * from "./base64.ts";
+export * from "./base64url.ts";
+export * from "./hex.ts";
+// TODO: change to * after varint decode/encode functions are removed
+export {
+  decodeVarint,
+  decodeVarint32,
+  encodeVarint,
+  MaxUInt64,
+  MaxVarIntLen32,
+  MaxVarIntLen64,
+} from "./varint.ts";