first commit: one-api base code + SAAS plan document

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: 项目群聊
+    url: https://openai.justsong.cn/
+    about: QQ 群：828520184，自动审核，备注 One API
+  - name: 赞赏支持
+    url: https://iamazing.cn/page/reward
+    about: 请作者喝杯咖啡，以激励作者持续开发