Add client feature table

Client-feature-table.md

@@ -0,0 +1,39 @@
+| Client                  | codeLens  | Diagnostics | documentHighlight | Custom Location[] requests | hierarchicalDocumentSymbol |
+|-------------------------|---|-----------------|---|---------|---|
+| [atom-ide-ccls]         | ✓ | ✓               | ✓ |         |   |
+| [eglot]                 |   | flymake         | ✓ |         |   |
+| [emacs-ccls]            | ✓ | lsp-ui-flycheck | ✓ | ✓       | ✓ |
+| [ale]                   |   | ✓               |   |         |   |
+| [LanguageClient-neovim] |   | ✓               | ✓ | ✓       |   |
+| [vim-lsp]               |   |                 |   |         |   |
+| [vscode-ccls]           | ✓ | ✓               | ✓ | Partial |   |
+
+| Client                  | hover | onTypeFormatting | semanticHighlight | signatureHelp | snippets |
+|-------------------------|-------|------------------|-------------------|---------------|----------|
+| [atom-ide-ccls]         | ✓     | ✓                | ✓                 | ✓             | ✓        |
+| [eglot]                 | ✓     |                  |                   | echo area     | ✓        |
+| [emacs-ccls]            | ✓     | ✓                | ✓                 | echo area     | ✓        |
+| [ale]                   | ✓     |                  |                   |               |          |
+| [LanguageClient-neovim] | ✓     |                  |                   | ✓             |          |
+| [vim-lsp]               | ✓     |                  |                   |               |          |
+| [vscode-ccls]           | ✓     | ✓                | ✓                 | dropdown      | ✓        |
+
+* Atom IDE: [atom-ide-ccls]
+* Emacs: [eglot] [emacs-ccls](depended on [lsp-mode])
+* (Neo)Vim: [ale] [coc.nvim] [LanguageClient-neovim] [vim-lsp]
+* VSCode: [vscode-ccls]
+
+### Custom `Location[]` requests
+
+ccls supports many cross reference exntensions (requests that return `Location[]` like `textDocument/definition`), see
+https://github.com/MaskRay/ccls/wiki/FAQ#definitions and following sections.
+
+[ale]: https://github.com/w0rp/ale
+[coc.nvim]: https://github.com/neoclide/coc.nvim
+[eglot]: https://github.com/joaotavora/eglot
+[emacs-ccls]: https://github.com/MaskRay/emacs-ccls
+[atom-ide-ccls]: https://github.com/isundaylee/atom-ide-ccls
+[LanguageClient-neovim]: https://github.com/autozimu/LanguageClient-neovim
+[lsp-mode]: https://github.com/emacs-lsp/lsp-mode
+[vim-lsp]: https://github.com/prabirshrestha/vim-lsp
+[vscode-ccls]: https://github.com/MaskRay/vscode-ccls

_Sidebar.md

@@ -10,3 +10,4 @@
   - [[vim-lsp]]
   - [[Visual Studio Code]]
 * [[Debugging]]
+* [[Client feature table]]