Add README

Author: coderick14

README.md

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+![Built with love](http://forthebadge.com/images/badges/built-with-love.svg)
+# Tusker
+A dead simple todo manager in *less than 100 lines* of Bash.  
+For those who live in the terminal.
+
+### Installation
+Just download the executable from [releases](https://github.com/coderick14/tusker/releases) and put it in your `$PATH`. Period.  
+Type `tusker help` to get started.
+
+### Usage
+- Add a task
+```
+tusker add "The task that I would've forgotten"
+```
+- Show current tasks *[ID, Status, Description, CreatedAt]*
+```
+tusker show
+     1	❌      Collect laundry                  25 April 2018 11:53:21
+     2	❌      Collect NOC certificate          25 April 2018 11:53:23
+     3	❌      Fill rems                        25 April 2018 11:53:25
+```
+- Mark a task as done
+```
+tusker check 1
+tusker show
+     1	✓      Collect laundry                  25 April 2018 11:53:21
+     2	❌      Collect NOC certificate          25 April 2018 11:53:23
+     3	❌      Fill rems                        25 April 2018 11:53:25
+```
+- Mark a task as undone
+```
+tusker uncheck 1
+tusker show
+     1	❌      Collect laundry                  25 April 2018 11:53:21
+     2	❌      Collect NOC certificate          25 April 2018 11:53:23
+     3	❌      Fill rems                        25 April 2018 11:53:25
+```
+- Delete a task from the list
+```
+tusker del 2
+tusker show
+     1	❌      Collect laundry                  25 April 2018 11:53:21
+     2	❌      Fill rems                        25 April 2018 11:53:25
+```
+
+### Tip
+Add `tusker show` at the end of your `.bashrc`, `.zshrc` or `config.fish` to get reminded about your pending tasks whenever you fire up a terminal.
+
+### Why tusker?
+- No dependencies. Seriously.
+- Simple. So that you can focus on what's important, which is **finishing your tasks**.
+
+### Features and contributions
+`tusker` was written the night before my semester examination because I kept forgetting the topics I had skipped. So if you'd like to report a bug or add a feature, feel free to raise an issue or send a pull request!!