docs: add examples for tp.obsidian module

docs/src/internal-functions/internal-modules/obsidian-module.md

@@ -4,5 +4,27 @@
 
 This is mostly useful when writing scripts. 
 
-Refer to the obsidian API [declaration file](https://github.com/obsidianmd/obsidian-api/blob/master/obsidian.d.ts) for more information.
+Refer to the Obsidian API [declaration file](https://github.com/obsidianmd/obsidian-api/blob/master/obsidian.d.ts) for more information.
 
+## Examples
+
+```javascript
+// Get all folders
+<%
+app.vault.getAllLoadedFiles()
+  .filter(x => x instanceof tp.obsidian.TFolder)
+  .map(x => x.name)
+%>
+
+// Normalize path
+<% tp.obsidian.normalizePath("Path/to/file.md") %>
+
+// Html to markdown
+<% tp.obsidian.htmlToMarkdown("\<h1>Heading\</h1>\<p>Paragraph\</p>") %>
+
+// HTTP request
+<%*
+const response = await tp.obsidian.requestUrl("https://jsonplaceholder.typicode.com/todos/1");
+tR += response.json.title;
+%>
+```