* Add descriptions for folder structure + node

* Beef up descriptions of project components

* Fix list formatting

* Add note about nightly Rust

* Update README.md

Co-authored-by: Tomasz Drwięga <[email protected]>

* Update README.md

Co-authored-by: Tomasz Drwięga <[email protected]>

* Reword Tomek's currency-exchange suggestion

* Add link to Substrate's installation guide

Co-authored-by: Tomasz Drwięga <[email protected]>

commit 13c9db4a90df62bec88ab0426f1e568aab1ecf8a
Author: Hernando Castano <[email protected]>
Date:   Sun Feb 2 22:02:38 2020 -0500

    Add README file

commit adf214d0506ba10bbeb3bca8578fd1926d818187
Author: Hernando Castano <[email protected]>
Date:   Sun Feb 2 21:52:09 2020 -0500

    Add EditorConfig file

commit 23b633e9df4bfd72fb10e57a4fd5d7e53755b490
Author: Hernando Castano <[email protected]>
Date:   Sun Feb 2 21:51:58 2020 -0500

    Move License to top level and remove .keep files