Update books.md to add book form links

docs/books.md

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 We maintain a physical book archive with over 500 books available to Newspeak House members.
 
-Booking system coming soon.
+If you would like to loan books out of the book archive, become a paying Newspeak Member and then email us at cohort@newspeak.house to give you a library card!
+
+You can browse the entire collection here:
+
+[Browse available books](https://airtable.com/appz1OhNtkhOphFqu/shrotWVkgLUzCXxNQ/tbl3bXZiWVgZrF81C)
+
+Once you have made your selection and found the book on the bookshelf in the drawing room, you can take out the book officially using the following form:
+
+[Check out books](http://b8480ssw844o4ocgswkkkc4c.37.27.16.70.sslip.io/checkout_book_form)
+
+Once you are done with a book (in a reasonable amount of time), you can use this form to return the book:
+
+[Return books](http://b8480ssw844o4ocgswkkkc4c.37.27.16.70.sslip.io/return_book_form)
 
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