config: add MCP server and environment configuration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.env.example

@@ -0,0 +1,2 @@
+OPENPROJECT_URL=https://your-instance.openproject.com
+OPENPROJECT_API_KEY=your-api-key-here

.mcp.json.example

@@ -0,0 +1,12 @@
+{
+  "mcpServers": {
+    "openproject": {
+      "command": "node",
+      "args": ["mcp/openproject/dist/index.js"],
+      "env": {
+        "OPENPROJECT_URL": "https://openproject.kollect.biz/openproject",
+        "OPENPROJECT_API_KEY": "<YOUR_API_KEY_HERE>"
+      }
+    }
+  }
+}