Add click_form.pdf test PDF.

This is a handwritten version of the checkbox / radio button PDF from
https://pdfium-review.googlesource.com/56870

Change-Id: I88476edd6f2642908742e8c11eb4acf6941a1b20
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/57890
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/testing/resources/click_form.in b/testing/resources/click_form.in
new file mode 100644
index 0000000..439f818
--- /dev/null
+++ b/testing/resources/click_form.in
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