docs: file input example

EXAMPLE_VAULT/000 - Templates/file input example.md

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+<%*
+const modalForm = app.plugins.plugins.modalforms.api;
+const result = await modalForm.openForm('file_input');
+tR += result.asFrontmatterString();
+console.log(result.file)
+-%>
+
+Here is the file manually rendered
+ ![[<% result.file.value.name %>]]
+
+And here is the file leveraging the shorthand to get a markdown link
+<% result.file.link %>
+
+Some TFile proxy properties:
+
+- path: <% result.file.value.path %>
+- name: <% result.file.value.name %>
+- basename: <% result.file.value.basename %>
+- extension: <% result.file.value.extension %>
+
+Some TFile properties:
+
+- ctime: <% result.file.value.TFile.stat.ctime %>
+- mtime: <% result.file.value.TFile.stat.mtime %>
+- size: <% result.file.value.TFile.stat.size %>