Explain the project purpose and build steps

Author: alexm

README.md

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+Barcelona Perl & Friends
+========================
+
+The event formerly known as _Barcelona Perl Workshop_ mutated in
+2017 to what's currently a more accurate description. Even though
+the _Perl Workshop_ name was used traditionally for such events,
+only people inside the Perl community understood that it wasn't
+actually a workshop but a smaller conference in most cases.
+
+The [Barcelona Perl Mongers](http://barcelona.pm) have long
+embraced all sorts of people from other communities in their
+events, thus making the new name a more appropiate match to
+their usual attendees.
+
+List of Events
+--------------
+
+* [Barcelona Perl & Friends 2018](http://friends.barcelona.pm/2018)
+
+How to Build the Current Website
+--------------------------------
+
+For docker fans:
+
+```
+cd 2018/_src
+with_docker=please ./build
+```
+
+Without docker:
+
+```
+cd 2018/_src
+sudo apt install cpanminus libimage-magick-perl
+./build
+```
+
+When you're happy with the results, just commit and push them to
+master or make a pull request for others to review.
+
+Copyright & License
+-------------------
+
+Copyright © 2017-2018 Barcelona Perl Mongers http://barcelona.pm/
+
+```
+This program is free software; you can redistribute it and/or modify
+it under the terms of the "Artistic License" which comes with Perl.
+See LICENSE for details.
+```