edit README.md file

README.md

@@ -6,12 +6,20 @@ hasher is similar to earlier ApplianceWare/ALT Linux [sandman](http://old.linux.
 
 It's included into [builder starterkit](https://en.altlinux.org/Starterkits/builder) ready-to-use.
 
+# What is an eterbuilder?
+
+The set of packages : eepm, erc and etersoft-build-utils
+
+# How to build this image
+
+$ docker build -t eterbuilder path_to_Dockerfile
+
 # How to use this image
 
 Run:
 
 ```console
-$ docker run -it --name some-hasher azol/altlinux-sisyphus-hasher
+$ docker run -it --name some-hasher eterbuilder
 ```
 
 Build packages: