Add github page

gh_pages/Gemfile

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+source "https://rubygems.org"
+gem "jekyll", "~> 4.3.3"
+gem "minima", "~> 2.5"

gh_pages/index.md

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+---
+title: TuiView
+---
+
+# TuiView
+
+![TuiView](tuiview.png)
+
+A PyQt-based lightweight Raster GIS
+
+| ![geolink](geolink_small.png) | ![plot](plot_small.png) | ![profile](profile_small.png) |
+| ![RAT](rat_small.png) | ![value](simple_small.png) | ![vector](vector_small.png) |
+
+TuiView is a lightweight raster GIS with powerful raster attribute table manipulation abilities. Features of TuiView include:
+
+- "Geo-linking" - 2 or more windows linked so they move and zoom together
+- Querying and plotting of raster values
+- Overlaying and querying of vector layers
+- Ability to stretch data for viewing in a number of ways, and ability to set a default stretch for each type of file
+- Saving and loading of stretch information into text or image files
+- Profile tool
+- Display of raster attribute tables and highlighting of rows for queried pixel
+- Selection of raster attribute table rows based on a query, or through geographical selection
+- Creation of new attribute table columns and updating of columns
+- Flicker tool
+
+Major development work on this project has been funded by [Landcare Research](https://www.landcareresearch.co.nz). 
+
+## Download
+
+### Binaries
+
+Once you have installed [Conda Forge](https://github.com/conda-forge/miniforge), run the following commands on the command line to install TuiView from the "conda-forge" channel:
+
+```bash
+conda create -n myenv tuiview
+conda activate myenv
+```
+
+### Source
+
+TuiView requires: Python > 3.5, Numpy, GDAL and PyQt.
+Download releases through git at [GitHub](https://github.com/ubarsc/tuiview).
+
+## Documentation
+
+User Documentation is available in the [TuiView wiki](https://github.com/ubarsc/tuiview/wiki).
+
+There is also [Developer's Documentation](https://tuiview.readthedocs.io/en/latest/) available.