feat: 更新PR模板, 添加对外变确认项

1.更新PR模板, 添加对外变确认项
2.添加历史版本的CHANGELOG

Close #I63L3D
Signed-off-by: Nzhushengle <zhushengle@huawei.com>
Change-Id: I22f64cd0bc5ad083806edd4ff00d955cb81bef0e

.gitee/PULL_REQUEST_TEMPLATE.zh-CN.md

@@ -10,6 +10,12 @@
 ### 测试用例（新增、改动、可能影响的功能）
 
 
+### 是否涉及对外变更（典型的如：对外API规格变更、新增对外接口等等）
+
+必须选择一项（在MarkDown模式下用[x]替换[ ]即可勾选对应选项）:
+- [ ] 是，涉及对外变更: 需要在commit message中按【[模板要求](https://gitee.com/openharmony/kernel_liteos_m/wikis/Commit%20message%E8%A7%84%E8%8C%83)】描述变更点
+- [ ] 否，不涉及对外变更
+
 ### 是否需要同步至release（如：3.0LTS ... ）分支？
 
 必须选择一项（在MarkDown模式下用[x]替换[ ]即可勾选对应选项）:

README.md

@@ -86,6 +86,12 @@ For details about how to develop the first application, see:
 
 -   [Developing the First Example Program Running on Hi3516](https://gitee.com/openharmony/docs/blob/master/en/device-dev/quick-start/quickstart-lite-steps-hi3516-running.md)
 
+## Contribution<a name="section1371123476304"></a>
+
+[How to involve](https://gitee.com/openharmony/docs/blob/HEAD/en/contribute/contribution.md)
+
+[Commit message spec](https://gitee.com/openharmony/kernel_liteos_m/wikis/Commit%20message%E8%A7%84%E8%8C%83)
+
 ## Repositories Involved<a name="section1371113476307"></a>
 
 [Kernel subsystem](https://gitee.com/openharmony/docs/blob/master/en/readme/kernel.md)

README_zh-HK.md

@@ -82,6 +82,12 @@ OpenHarmony LiteOS-A內核支持Hi3516DV300（[介紹](https://gitee.com/openhar
 
 ### 編譯構建<a name="section2081013992812"></a>
 
+## 貢獻<a name="section1371123476304"></a>
+
+[如何貢獻](https://gitee.com/openharmony/docs/blob/HEAD/zh-cn/contribute/%E5%8F%82%E4%B8%8E%E8%B4%A1%E7%8C%AE.md)
+
+[Commit message規範](https://gitee.com/openharmony/kernel_liteos_m/wikis/Commit%20message%E8%A7%84%E8%8C%83)
+
 開發者開發第一個應用程序可參考：
 
 - [helloworld for Hi3516DV300](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/quickstart-lite-steps-hi3516-running.md)。

README_zh.md

@@ -88,6 +88,12 @@ OpenHarmony LiteOS-A内核支持[Hi3516DV300](https://gitee.com/openharmony/docs
 
 -   [helloworld for Hi3516DV300](https://gitee.com/openharmony/docs/blob/master/zh-cn/device-dev/quick-start/quickstart-lite-steps-hi3516-running.md)。
 
+## 贡献<a name="section1371123476304"></a>
+
+[如何贡献](https://gitee.com/openharmony/docs/blob/HEAD/zh-cn/contribute/%E5%8F%82%E4%B8%8E%E8%B4%A1%E7%8C%AE.md)
+
+[Commit message规范](https://gitee.com/openharmony/kernel_liteos_m/wikis/Commit%20message%E8%A7%84%E8%8C%83)
+
 ## 相关仓<a name="section1371113476307"></a>
 
 [内核子系统](https://gitee.com/openharmony/docs/blob/master/zh-cn/readme/%E5%86%85%E6%A0%B8%E5%AD%90%E7%B3%BB%E7%BB%9F.md)