updating readme for distribution procedures

README.md

@@ -29,3 +29,13 @@ promgrep_thing_count 3
 * "--gauge [metric_name]@[regex]" defines regex rules for extracting metrics from input stream and expose it as [Prometheus Gauges](https://prometheus.io/docs/concepts/metric_types/#gauge). The regex must have a group match for a number ([0-9\\.]+) as it will be used as the value in metrics. If there is another regex group that does not resolve to a number, the matched contents will be used as "label" value in metric.
 
 * "--output (none|match|all)" determines what will be written to stdout. 'none' for silence, 'match' for lines matches by regex rules or 'all' to input to output passthrough. Defaults to 'match'
+
+## Distribution build
+
+Use docker-compose.yml from this repo
+
+Run `docker-compose up --build`
+
+Get distribution packages at workspace dir /dist
+
+Copy these files to Github under specific "Release" version