feat: Readme update

Author: Chleba

README.md

@@ -1,2 +1,36 @@
 # tui-slides
-Terminal Presentation program with modern TUI
+Terminal Presentation tool with modern TUI capable to render images in terminal and with many more widgets.
+
+<img src="./tui-slides.png" width="100" />
+
+## Install via cargo
+```
+cargo install tui-slides
+```
+
+## Usage
+To create new presentation You have to create a folder with JSON file where you can create Your presentation slides.
+Example file is here.
+
+## Run
+To start `tui-slides` we just call it with argument `-j` where we specify path to JSON file with slides data.
+```
+tui-slides -j="./path_to_slides/slides.json"
+```
+
+### JSON: root
+Main section of slide config is `box_size`. Here we set fixed size of content box.
+```
+"box_size": { "width": 50, "height": 50 }
+```
+
+### JSON: slides
+`slides` property is defining content. Slide content have it's `type`, `content`, `rect` & `color`.
+There are few types at the moment but in the future there should be support for every widget in Ratatui library.
+Supported widgets ATM:
+- Image
+- Block
+- Paragraph
+- Line
+- Bigtext
+