README updates

README.md

@@ -4,6 +4,7 @@ PapermergeJS is frontend part i.e. web-based user interface of Papermerge
 Document Management System. It is meant to be used in conjunction with
 [Papermerge REST API backend server](https://github.com/papermerge/papermerge-core).
 
+
 ## What is Papermerge DMS?
 
 Papermerge is an open source document management system (DMS) designed
@@ -11,15 +12,18 @@ for **digital archives**. Instead of having piles of paper documents all over
 your desk, office or drawers - you can quickly scan them and configure your
 scanner to directly upload to Papermerge DMS.
 
+
 ## What is a Digital Archive?
 
 Simply put a digital archive is a scanned document. In broader sense, digital
 archives are documents whose content does not change in time; a good example of
-such documents are PDF files. If you take a picture of a document, you'll end
+such **documents are PDF files**. If you take a picture of a document, you'll end
 up with a "scanned document" in png, jpeg or whatever format that picture is
 stored. In context of papermerge a picture of a document made with you mobile
 phone is also a digital archive.
 
+Papermerge **supports pdf, jpeg, png and tiff** file formats.
+
 
 ## Prerequisites
 
@@ -32,12 +36,14 @@ development mode, you will need some extras:
 
 Technically speaking, PapermergeJS is written using [EmberJS](https://emberjs.com/) web framework.
 
+
 ## Installation
 
 * `git clone git@github.com:papermerge/papermerge.js.git` this repository
 * `cd papermerge.js`
 * `npm install`
 
+
 ## Running / Development
 
 * `ember serve`
@@ -50,10 +56,12 @@ Technically speaking, PapermergeJS is written using [EmberJS](https://emberjs.co
 * `ember test`
 * `ember test --server`
 
+
 ### Linting
 
 * `npm run lint`
 
+
 ### Building
 
 * `ember build` (development)