Added readme content.

README.md

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 # EmailIndexer
-Utility for generating Lucene indexes for collections of emails.
+Utility for generating Lucene indexed datasets for collections of emails, and provides a browser application for browsing and interacting with datasets.
+
+## Setup
+Simply download the latest available JAR file via the **Releases** section of this GitHub repository, and run it. The email dataset browser application will open to an empty interface.
+
+**Note**: Java version 17 or higher is required to run this program.
+
+To start analyzing some emails, you can either:
+- Generate a new dataset
+- Open an existing dataset, via `File > Open Dataset`. You may open datasets from directories, or from compressed ZIP files; in the latter case, the zip file will be unzipped to a directory.
+
+## Generating a Dataset
+