add Zed editor guide

editor-zed.md

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+# Using serve-d with [Zed][1]
+
+---
+
+Support for D including serve-d is included with the Zed "D" plugin.
+
+This plugin can be installed using the "zed: extensions" command
+or the `Zed ... Extensions ...` menu item.
+
+The plugin will automatically download the most recent release of serve-d.
+
+This also makes use of a [Tree-sitter grammar for D][2] so syntax highlighting
+and related functionality is very fast, and of serve-d for other advanced
+capabilities.
+
+Various settings for serve-d can be made in either your global personal
+settings, or in project specific settings.
+
+The settings object is a JSON file, and serve-d can be added under the
+"serve-d" member of the "lsp" top-level settings.
+The binary can also be relocated if a custom binary should be used instead.
+
+An example configuration:
+
+```json
+  "lsp": {
+    "serve-d": {
+      "settings": {
+        "d": {
+          "enableFormatting": false,
+          "manyProjectsThreshold": 20
+        },
+        "dscanner": {
+          "ignoredKeys": ["dscanner.style.long_line"]
+        }
+      },
+      "binary": {
+        "path": "/Users/garrett.damore/Projects/serve-d/serve-d"
+      }
+    }
+  }
+```
+
+[1]: https://zed.dev "Zed Editor Web Site""
+[2]: https://github.com/gdamore/tree-sitter-d/ "Tree-sitter Grammar for D"