add readme

README.md

@@ -1,3 +1,17 @@
 # csv2xls
 
-Convert CSV files to XLS files with no formatting
+[![Build Status](https://drone.stevenpolley.net/api/badges/steven/csv2xls/status.svg)](https://drone.stevenpolley.net/steven/csv2xls)
+
+Convert CSV files to XLS files with no formatting.  See the releases page for pre-compiled binaries availabel for Windows and Linux on x86-64.
+
+### Usage
+
+```bash
+./csv2xls.exe -f=<CSV Input File> -o=<XLSX Output File> -d=<Delimiter>
+```
+
+### Build from source
+
+1. Ensure you have golang toolchain installed from https://go.dev
+2. Clone this repository
+3. Run the command go build <path to repo>