chore: add bot template

assistants/template/README.md

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+# Bot template
+
+You can contribute your own bot with this template.

assistants/template/index.ts

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+// It's a template for creating new bots.
+export default {
+  id: "the-id-of-your-bot",
+  name: "The name of your bot",
+  description: "The description of your bot",
+  avatar: "The avatar link of your bot",
+  // The function to get the prompt of the bot.
+  getPrompt: (input: string): string => {
+    // You can do some preprocessing here.
+    const formatedInput = input.trim().toLowerCase();
+    return `The prompt of your bot. The question is ${formatedInput}`;
+  },
+};