[docs] new pages on doctype and markup

docs/user/knowledge/docs.user.knowledge.attachment_csv.md

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+---
+{
+	"_label": "Attachement and CSV files"
+}
+---
+
+#### How to Attach files?
+
+When you open a form, on the right sidebar, you will see a section to attach files. Click on “Add” and select the file you want to attach. Click on “Upload” and you are set.
+
+#### What is a CSV file?
+
+A CSV (Comma Separated Value) file is a data file that you can upload into ERPNext to update various data. Any spreadsheet file from popular spreadsheet applications like MS Excel or Open Office Spreadsheet can be saved as a CSV file.
+
+If you are using Microsoft Excel and using non-English characters, make sure to save your file encoded as UTF-8. For older versions of Excel, there is no clear way of saving as UTF-8. So save your file as a CSV, then open it in Notepad, and save as “UTF-8”. (Sorry blame Microsoft for this!)
+