Updated README.md and added Screenshots.

README.md

@@ -1,5 +1,6 @@
 # i3lock Delta
-This script downloads a new image from [Unsplash][1]. It checks whether the screen was locked every 5 minutes. In case of no Internet, it retries every 1 minute and displays the previous picture untill a new one is downloaded.
+
+This prorgam downloads a new image from [Unsplash][1]. It checks whether the screen was locked every 5 minutes. In case of no Internet, it retries every 1 minute and displays the previous picture untill a new one is downloaded. The script allows to filter random images based on your choices.
 
 ## Dependencies
 
@@ -9,6 +10,42 @@ This script downloads a new image from [Unsplash][1]. It checks whether the scre
 + [i3lock-color][5] - Available in AUR (For Arch users). Fork of i3lock with more features. Do not use i3lock since this program utilizes the features of i3lock-color.
 + [bash][6] - Most probably will be installed already.
 
+## Screenshots
+
+![Screenshot](screenshots/one.png)
+
+![Screenshot](screenshots/two.png)
+
+## Installation
+
+Run the following commands
+```bash
+cd
+git clone https://github.com/Ceda-EI/i3lock-delta
+cd i3lock-delta
+./install
+```
+
+Save your Unsplash `applicationId` in `~/i3lock-delta/api_key`. You can get the `applicationId` from registering at [Unsplash Developer.][7]
+
+## Usage
+
++ Check that the `applicationId` in ``~/i3lock-delta/api_key`` is correct.
++ Add `~/i3lock-delta/download_daemon &` to your startup applications. Also, run `~/i3lock-delta/download_daemon &` to avoid rebooting.
++ To lock the screen, run `~/i3lock-delta/lock`. You can map this to your lock key combination.
+
+## Configuration
+
+The lock screen customization has been made easier using `~/.config/lock_preferences`,`api_key`, `config` and `box_config` files.
+
++ If the random background should be selected from certain topics, enter the topics in `~/.config/lock_preferences` with one topic per line i.e. each line should contain only one topic.
++ To insert your own Unsplash API Key, type/paste it in the `~/i3lock-delta/api_key` file.
++ To change the ring color/size or date/time color/style/size/font uncomment (remove the # at start) the corresponding line in `~/i3lock-delta/config` and set the value after the `=` sign.
++ To change the position of box drawn for the clock or the position of the text for photographer, edit `~/i3lock-delta/box_config`.
+
+## Fonts Used
++ Font used for date: [Space Age][8]
++ Font used for time: [Neuropolitical][9]
 
 <!--Links-->
 [1]: https://unsplash.com
@@ -17,3 +54,6 @@ This script downloads a new image from [Unsplash][1]. It checks whether the scre
 [4]: https://imagemagick.org
 [5]: https://github.com/PandorasFox/i3lock-color
 [6]: https://www.gnu.org/software/bash/
+[7]: https://unsplash.com/developers
+[8]: https://dl.dafont.com/dl/?f=space_age
+[9]: https://dl.dafont.com/dl/?f=neuropolitical