workflow: add pull request template

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,13 @@
+Thanks for your PR, you're awesome! 👍
+
+Please ensure you have read the [Contributing code](https://github.com/trpc-group/trpc-go/blob/main/CONTRIBUTING.md#contributing-code). 
+
+The PR title should be formatted as follows: `client: remove internal info`
+  - The package name goes before the colon
+  - The part after the colon uses the verb tense + phrase that completes the blank in,
+    "This change modifies tRPC-Go to ___________"
+  - Lowercase verb after the colon
+  - No trailing period
+  - Keep the title as short as possible. ideally under 76 characters or shorter.
+
+Delete these instructions once you have read and applied them.

CONTRIBUTING.md

@@ -99,6 +99,9 @@ The [benchstat](https://godoc.org/golang.org/x/perf/cmd/benchstat) tool is conve
 The special notation "Fixes #12345" associates the change with issue 12345 in the tRPC-Go issue tracker.
 When this change is eventually applied, the issue tracker will automatically mark the issue as fixed.
 
+- If there is a corresponding issue, add either `Fixes #12345` or `Updates #12345` (the latter if this is not a complete fix) to this comment
+- If referring to a repo other than `trpc-go` you can use the `owner/repo#issue_number` syntax: `Fixes trpc-group/tnet#12345`
+
 
 ## Miscellaneous topics
 

CONTRIBUTING.zh_CN.md

@@ -91,6 +91,9 @@ tRPC-Go 中的提交消息遵循一套特定的约定，我们将在本节中讨
 特殊表示法 "Fixes #12345" 将变更与 tRPC-Go issue 跟踪器中的 issue 12345关联。
 当此变更最终应用时，issue 跟踪器将自动将该 issue 标记为已修复。
 
+- 如果有相关 issue，请在此评论中添加 `Fixes #12345` 或` Updates #12345`（如果这不是完整的修复）
+- 如果涉及到的仓库不是 `trpc-go`，则可以使用 `owner/repo#issue_number` 语法：`Fixes trpc-group/tnet#12345`
+
 ## 其他主题
 
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