updated readme

README.md

@@ -2,11 +2,16 @@
 
 a simple http server serving a page to execute scans
 
-
 ## environment variables
 
 - `GO_SCAN_ADDRESS`: listen address of the http server  
 - `GO_SCAN_PORT`: port of the http server  
 - `GO_SCAN_SCANNER`: name of the scanner to use  
 - `GO_SCAN_OUTPUTDIRECTORY`: path to the output directory for scans  
-- `GO_SCAN_ARGUMENTS`: extra arguments to pass to the scanimage command  
+- `GO_SCAN_ARGUMENTS`: extra arguments to pass to the scanimage command  
+
+## build process
+
+- `git clone https://git.velvettear.de/velvettear/go-scan.git`
+- `cd go-scan`
+- `go build`