Improve readme

README.md

@@ -1,4 +1,8 @@
-# haskell-cron-matcher
+# Haskell cron matcher
+
+Made just for fun and test haskell.
+
+## Usage
 
 Match current time with given cron pattern.
 
@@ -9,3 +13,14 @@ See return code for result:
 * 0 - matched
 * 1 - dismatched
 * 2 - pattern parse error
+
+## Build
+
+You can use docker for build Stack and application:
+
+	$ make build-docker
+	$ make build
+
+## Tests
+
+	$ make test