Merge pull request #134 from dqbd/dqbd/js-readme

Update guidance on lite

.changeset/tame-turkeys-compete.md

@@ -0,0 +1,5 @@
+---
+"js-tiktoken": patch
+---
+
+Update guidance on lite

js/README.md

@@ -9,9 +9,36 @@ Install the library from NPM:
 npm install js-tiktoken
 ```
 
-## Usage
+## Lite
 
-Basic usage follows, which includes all the OpenAI encoders and ranks:
+You can only load the ranks you need, which will significantly reduce the bundle size:
+
+```typescript
+import { Tiktoken } from "js-tiktoken/lite";
+import o200k_base from "js-tiktoken/ranks/o200k_base";
+
+const enc = new Tiktoken(o200k_base);
+assert(enc.decode(enc.encode("hello world")) === "hello world");
+```
+
+Alternatively, encodings can be loaded dynamically from our CDN hosted on Cloudflare Pages.
+
+```typescript
+import { Tiktoken } from "js-tiktoken/lite";
+
+const res = await fetch(`https://tiktoken.pages.dev/js/o200k_base.json`);
+const o200k_base = await res.json();
+
+const enc = new Tiktoken(o200k_base);
+assert(enc.decode(enc.encode("hello world")) === "hello world");
+```
+
+## Full usage
+
+If you need all the OpenAI tokenizers, you can import the entire library:
+
+> [!CAUTION]
+> This will include all the OpenAI tokenizers, which may significantly increase the bundle size. See
 
 ```typescript
 import assert from "node:assert";