Update README.md

Adds section explainer

Author: robertagora

basics/how-storage-works/README.md

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 # How storage works
 
+This section is an introduction to two methods of performing storage deals --through the [Filecoin Plus](https://docs.filecoin.io/basics/how-storage-works/filecoin-plus) program or through [various storage onramps](https://docs.filecoin.io/basics/how-storage-works/storage-onramps).  This section also explains the features and advantages of using [Filecoin and IPFS](https://docs.filecoin.io/basics/how-storage-works/filecoin-and-ipfs).  
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