Added NEWS.md for original version

NEWS.md

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+# gutenbergr 0.1
+
+* First version of package, including
+  * `gutenberg_download` function, for downloading one or more works from Project Gutenberg using Gutenberg IDs
+  * Datasets of Project Gutenberg metadata: `gutenberg_metadata`, `gutenberg_subjects`, `gutenberg_authors`
+  * `gutenberg_works` function to retrieve filtered version of `gutenberg_metadata`
+  * Introductory vignette including basic examples of downloading books
+  * Unit tests for `gutenberg_download` and `gutenberg_works`
+* Added a `NEWS.md` file to track changes to the package.