refactor: add default description for templates (#1418)

* chore: 给默认值

* perf: 不同选择有意义的值

Author: txp1035

suites/boilerplate/src/index.ts

@@ -51,11 +51,17 @@ export default async ({
     },
   );
   let hasPlugin = false;
+  const descriptions = {
+    site: 'A static site based on dumi',
+    react: 'A react library developed with dumi',
+    theme: 'A theme package for dumi',
+  };
   const questions: prompts.PromptObject[] = [
     {
       name: 'description',
       type: 'text',
       message: `Input project description`,
+      initial: descriptions[type],
     },
     {
       name: 'author',