improved readme

README.md

@@ -1,3 +1,25 @@
 # (G)o (h)ome(p)age
 GHP is a FastCGI auto-indexer similar to the NGINX Auto-index
 feature, but allows for fully customisable index pages via Go Templates
+
+## Installation
+This is a very dumb single-file program. Install it wherever you like :D
+For use with Nginx, see the [sample nginx config](sample.nginx.conf)
+
+## Usage
+Just run `ghp`!
+
+`ghp -h` for full list of config options
+
+
+### Writing index files
+Index files are written and rendered as [Go Templates](https://golang.org/pkg/text/template/).
+The currently-served directory's contents are passed as data to the index with the type `[]os.FileInfo`, and can be referenced with `.`.
+For more detail, see [an example](samples/index.gohtml)
+
+### Additional util functions
+
+ - `Request`: Get the current request (*http.Request)
+
+ - `BaseURL( *http.Request )`: returns the current request's `URL.Path`, formatted for use with the HTML `<base>` tag
+