clangd: add page (#9419)

* clangd: add page

* Update clangd.md

* Added suggestions

* Update clangd.md

pages/common/clangd.md

@@ -0,0 +1,17 @@
+# clangd
+
+> Language server that provides IDE-like features to editors.
+> It should be used via an editor plugin rather than invoked directly.
+> More information: <https://clangd.llvm.org/>.
+
+- Display available options:
+
+`clangd --help`
+
+- List of available options:
+
+`clangd --help-list`
+
+- Display version:
+
+`clangd --version`