add smithery yaml (#45)

* add smithery yaml

* make access mode required

Author: jssmith

smithery.yaml

@@ -0,0 +1,21 @@
+# Smithery configuration file: https://smithery.ai/docs/config#smitheryyaml
+
+startCommand:
+  type: stdio
+  configSchema:
+    # JSON Schema defining the configuration options for the MCP.
+    type: object
+    required:
+      - databaseUri
+      - accessMode
+    properties:
+      databaseUri:
+        type: string
+        description: URI for accessing the database, e.g., postgres://user:password@host:port/database.
+      accessMode:
+        type: string
+        description: The access mode for the MCP, e.g., "restricted" or "unrestricted".
+  commandFunction:
+    # A function that produces the CLI command to start the MCP on stdio.
+    |-
+    (config) => ({command: '/app/docker-entrypoint.sh', args: ['postgres-mcp', '--access-mode',config.accessMode], env: {DATABASE_URI: config.databaseUri}})