add .gitignore and updated readme to include commands to run

.gitignore

@@ -0,0 +1,21 @@
+# Build outputs
+*.xpi
+*.zip
+
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

README.md

@@ -19,10 +19,17 @@ Executes arbitrary JavaScript within Zotero's context.
 **Body:**
 ```json
 {
-  "code": "return await Zotero.Items.getAll();"
+  "code": "return await Zotero.Items.getAll(1, true, false);"
 }
 ```
 
+**Example Test:**
+```bash
+curl -X POST http://127.0.0.1:23119/zotero-js-bridge/execute \\
+     -H 'Content-Type: application/json' \\
+     -d '{"code": "return await Zotero.Items.getAll(1, true, false);"}'
+```
+
 ### `/zotero-js-bridge/findPDFsForItems`
 
 A specialized endpoint to trigger Zotero's "Find Available PDFs" feature for a specific list of item IDs.
@@ -35,7 +42,22 @@ A specialized endpoint to trigger Zotero's "Find Available PDFs" feature for a s
 }
 ```
 
-## Development
+**Example Test:**
+```bash
+curl -X POST http://127.0.0.1:23119/zotero-js-bridge/findPDFsForItems \\
+     -H 'Content-Type: application/json' \\
+     -d '{"itemIds": [123]}'
+```
+
+## Development and Building
+
+To build the project into an installable Zotero add-on (`.xpi` file), run the following command from the root of this repository:
+
+```bash
+rm -f zotero-js-bridge.xpi && zip -r zotero-js-bridge.xpi manifest.json bootstrap.js README.md
+```
+
+Then drag and drop the `zotero-js-bridge.xpi` file into the Zotero Add-ons manager to install it.
 
 - `manifest.json`: Zotero plugin manifest.
 - `bootstrap.js`: Handles plugin lifecycle and endpoint registration.