Update README

Author: gertvdb

README

@@ -1,3 +1,35 @@
-## Fork of Symfony 1 by Tactics
+[project-name]: Symfony 1
+[project-url]: https://github.com/Tactics/symfony1
+
+# Symfony 1
+[![Software License][ico-license]](LICENSE.md)
+
+Tactics Fork of Symfony 1 - PHP 7.4 compatible.
+
+## Install
+
+Make sure to add this to the *"repositories"* key in your ```composer.json```
+since this is a private package hosted on our own Composer repository generator Satis.
+
+```bash
+"repositories": [
+    {
+        "type": "composer",
+        "url": "https://satis.tactics.be"
+    }
+]
+````
+
+Then run the following command
+
+``` bash
+$ composer require tactics/symfony1
+```
+
+## Dependencies
+
+When this package requires a new dependency make sure to install it through the docker container.
+That way we can make sure the dependency is never out of sync with the php/composer version
+
+
 
-The branch 1.1 requires php 7.4