Added license and documentation files

Signed-off-by: Steve Winslow <swinslow@gmail.com>

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+SPDX-License-Identifier: CC-BY-4.0
+
+# spdx-go
+
+spdx-go is a collection of Go package intended to make it easier for Go
+programs to work with [SPDX®](https://spdx.org/) files.
+
+This software is in an extremely pre-alpha state (hence the "v0/" directory).
+
+## What it does
+
+spdx-go currently works with files conformant to version 2.1 of the SPDX
+specification, available at: https://spdx.org/specifications
+
+spdx-go provides the following packages:
+
+* *v0/spdx* - in-memory data model for the sections of an SPDX document
+* *v0/tvloader* - tag-value file loader
+
+## What it doesn't do
+
+spdx-go doesn't currently do any of the following:
+
+* work with files under any version of the SPDX spec *other than* v2.1
+* work with RDF files
+* output RDF or tag-value files
+* convert between RDF and tag-value files, or between different versions
+* enable applications to interact with SPDX files without needing to care
+  (too much) about the particular SPDX file version
+
+As a long-term goal, I am hoping to enable each of these. Code contributions
+are welcome!
+
+## Requirements
+
+At present, spdx-go does not require anything outside the Go standard library.
+
+## Licenses
+
+As indicated in `LICENSE-code.txt`, spdx-go **source code files** are provided
+and may be used, at your option, under *either*:
+* Apache License, version 2.0 (**Apache-2.0**), **OR**
+* GNU General Public License, version 2.0 or later (**GPL-2.0-or-later**).
+
+As indicated in `LICENSE-docs.txt`, spdx-go **documentation files** are
+provided and may be used under the Creative Commons Attribution
+4.0 International license (**CC-BY-4.0**).
+
+This `README.md` file is documentation, hence the CC-BY-4.0 license ID at
+the top of the file.