Make License a Markdown file. Add some more badges to README

Author: Daniel Gomes

LICENSE

@@ -0,0 +1,21 @@
+# The MIT License (MIT)
+
+Copyright (c) 2019 Daniel Gomes <[email protected]>
+
+> Permission is hereby granted, free of charge, to any person obtaining a copy
+> of this software and associated documentation files (the "Software"), to deal
+> in the Software without restriction, including without limitation the rights
+> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+> copies of the Software, and to permit persons to whom the Software is
+> furnished to do so, subject to the following conditions:
+>
+> The above copyright notice and this permission notice shall be included in
+> all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+> THE SOFTWARE.

LICENSE.md

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 # Minimalist and Typed Immutable Collections for PHP
-[![Build Status](https://travis-ci.org/dcsg/php-immutable-collections.svg?branch=master)](https://travis-ci.org/dcsg/php-immutable-collections) [![SymfonyInsight](https://insight.symfony.com/projects/8cc27627-24e7-407c-9839-766c9946eb2c/mini.svg)](https://insight.symfony.com/projects/8cc27627-24e7-407c-9839-766c9946eb2c) [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=alert_status)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections) [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=coverage)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections) [![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections) [![Bugs](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=bugs)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections) [![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=security_rating)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections)
+
+[![Latest Stable Version](https://poser.pugx.org/dcsg/php-immutable-collections/v/stable)](https://packagist.org/packages/dcsg/php-immutable-collections)
+[![License](https://poser.pugx.org/dcsg/php-immutable-collections/license)](https://packagist.org/packages/dcsg/php-immutable-collections)
+[![Build Status](https://travis-ci.org/dcsg/php-immutable-collections.svg?branch=master)](https://travis-ci.org/dcsg/php-immutable-collections)
+[![SymfonyInsight](https://insight.symfony.com/projects/8cc27627-24e7-407c-9839-766c9946eb2c/mini.svg)](https://insight.symfony.com/projects/8cc27627-24e7-407c-9839-766c9946eb2c)
+[![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=alert_status)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections)
+[![Coverage](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=coverage)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections)
+[![Vulnerabilities](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=vulnerabilities)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections)
+[![Bugs](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=bugs)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections)
+[![Security Rating](https://sonarcloud.io/api/project_badges/measure?project=dcsg_php-immutable-collections&metric=security_rating)](https://sonarcloud.io/dashboard?id=dcsg_php-immutable-collections)
+[![Total Downloads](https://poser.pugx.org/dcsg/php-immutable-collections/downloads)](https://packagist.org/packages/dcsg/php-immutable-collections)
 
 A library that provides a set of minimalist, typed and piped Immutable Collections for PHP.