add GitHub issue template for lsp

.github/ISSUE_TEMPLATE/lsp_bug_report.md

@@ -0,0 +1,47 @@
+---
+name: Language server client bug report
+about: Report a built-in lsp problem in Nvim
+title: ''
+labels:
+  - bug
+  - lsp
+---
+
+<!-- Before reporting: search existing issues and check the FAQ. -->
+
+- `nvim --version`:
+- language server name/version:
+- Operating system/version:
+
+<details>
+<summary>`nvim -c ":checkhealth nvim nvim_lsp"`</summary>
+
+<!-- Paste the results from `nvim -c ":checkhealth nvim nvim_lsp"` here. -->
+
+</details>
+
+<details>
+<summary>lsp.log</summary>
+
+<!--
+Please paste the lsp log before and after the problem.
+
+You can set log level like this.
+`:lua vim.lsp.set_log_level("debug")`
+
+You can find the location of the log with the following command.
+`:lua print(vim.lsp.get_log_path())`
+-->
+
+</details>
+
+### Steps to reproduce using `nvim -u NORC`
+
+```
+nvim -u NORC
+```
+
+### Actual behaviour
+
+### Expected behaviour
+