Add more information to the README and change license year (#64)

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020 Marcelo Duarte Trevisani
+Copyright (c) 2021 Marcelo Duarte Trevisani
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -6,3 +6,55 @@
 ![Grayskull](https://comicvine1.cbsistatic.com/uploads/original/4/49448/2661756-castle_grayskull.jpg)
 
 *"Skeleto~~n~~r's main goal is to conquer the mysterious fortress of Castle Grayskull, from which He-Man draws his powers. If he succeeds, Skeletor would be able to conquer not only Eternia, but the whole universe."* Adapted from [Wikipedia](https://en.wikipedia.org/wiki/Skeletor)
+-------------
+## Introduction
+
+The Grayskull project was created with the intention to eventually replace the
+`conda skeleton`. The main goal of this project is to generate concise recipes
+ for [conda-forge](https://conda-forge.org/).
+
+The current status of ``grayskull`` is generating recipes just looking for ``PyPI``,
+ but in the future we will expand that to also support to load recipes and also
+ generate recipes looking for other repositories, such as, CRAN, Conan, etc..
+
+## Installation
+
+It is possible to install this project using `pip`:
+```bash
+pip install grayskull
+```
+
+or `conda`, using the ``conda-forge`` channel:
+```bash
+conda install -c conda-forge grayskull
+```
+
+It is also possible to clone this repo and install it using `pip`:
+```bash
+git clone https://github.com/marcelotrevisani/grayskull.git
+cd grayskull
+pip install -e .
+```
+
+## Usage
+
+It is pretty simple to use `grayskull`. Just call it, pass the repository
+ (just `pypi` for now) and the package name.
+
+* Example:
+```bash
+grayskull pypi pytest
+```
+
+After that `grayskull` will create a folder with the same name as the package
+and inside of this folder it will generated the recipe (`meta.yaml`).
+
+* Example with `pytest` (`grayskull pypi pytest`):
+
+![Grayskull CLI](docs/images/cli_example_grayskull.gif)
+
+
+## License
+Copyright Marcelo Duarte Trevisani and others, 2020-2021.
+
+Distributed under the terms of the MIT license, grayskull is free and open source software.