docs: add more information and links to the README (#303)

### Motivation

Our README was pretty light on detail, hadn't been updated since we
released the Elevation data on the Registry of Open Data on AWS and on
Basemaps.

### Modifications

Added more links to docs / described AWS access / how to browse bucket

README.md

@@ -1,7 +1,26 @@
 # New Zealand Elevation
 
-Toitū Te Whenua makes New Zealand’s most up-to-date publicly owned elevation data freely available to use under an open licence.
-You can access this through the [LINZ Data Service](https://data.linz.govt.nz/data/category/elevation/).
+Toitū Te Whenua makes New Zealand's most up-to-date publicly owned elevation data freely available to use under an open licence. You can access this through the [LINZ Data Service](https://data.linz.govt.nz/data/category/elevation/), [LINZ Basemaps](https://basemaps.linz.govt.nz/@-41.8899962,174.0492437,z5?i=elevation) or the [Registry of Open Data on AWS](https://registry.opendata.aws/nz-elevation/).
+
+This repository contains STAC Collection metadata for each elevation dataset, as well as some guidance documentation:
+
+- [Naming](docs/naming.md) covers the s3://nz-elevation bucket naming structure
+- [Usage](docs/usage.md) shows how TIFFs can be interacted with from S3 using GDAL, QGIS, etc
+- [Elevation Compression](docs/tiff-compression) provides commentary and analysis on the compression options we explored.
+
+## AWS Access
+
+Toitū Te Whenua owns and maintains a public bucket which is sponsored and shared via the [Registry of Open Data on AWS](https://registry.opendata.aws/nz-elevation/) `s3://nz-elevation` in `ap-southeast-2`.
+
+Using the [AWS CLI](https://aws.amazon.com/cli/) anyone can access all of the imagery specified in this repository.
+
+```
+aws s3 ls --no-sign-request s3://nz-elevation/
+```
+
+### Browsing the S3 Bucket
+
+[STAC Browser](https://radiantearth.github.io/stac-browser/#/external/nz-elevation.s3.ap-southeast-2.amazonaws.com/catalog.json) can be used to browse through the contents of the S3 bucket.
 
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