update documentation

annotations/README.md

@@ -6,15 +6,18 @@ document contents, without changing the original document contents.
 Support for creating annotations in UniPDF is through the unipdf/annotator package.
 The annotator package creates the Annotation object and also an appearance stream, which is required to make
 the annotation look the same in all viewers.
+
 UniPDF's model package has support for all types of PDF annotations, whereas the annotator currently supports Square,
-Circle, Line annotations.  Support for more annotation types will be added over time.  If you need support for an
-unsupported annotation, please create an issue in this repository.
+Circle, Ellipse, Ink, Line, and File attachment annotations.  Support for more annotation types will be added over time.  
+
+If you need support for an unsupported annotation, please create an issue in this repository.
 
-The examples in this folder illustrate a few capabilities for creating ellipse, lines, rectangles.
+The examples in this folder illustrate a few capabilities for creating ellipse, file attachment, ink, lines, rectangles, and text annotation.
 
 ## Examples
 
 - [pdf_annotate_add_ellipse.go](pdf_annotate_add_ellipse.go) adds a circle/ellipse annotation to a specified location on a page.
+- [pdf_annotate_add_file.go](pdf_annotate_add_file.go) adds a file attachment annotation placed in certain position in a page.
 - [pdf_annotate_add_ink.go](pdf_annotate_add_ink.go) adds an ink annotation to a specified location on a page.
 - [pdf_annotate_add_line.go](pdf_annotate_add_line.go) adds a line with arrowhead between two specified points on a page.
 - [pdf_annotate_add_rectangle.go](pdf_annotate_add_rectangle.go) adds a rectangle annotation to a specified location on a page.