README.md file is added.

README.md

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+### The "Version" package
+=============
+This package provides --version flag feature to your cli.
+It recognize both short and long flags. Version number is
+automatically added from the latest tag in your git repo.
+-------------
+### Usage
+1. Download the package by **go get** command:
+```shell
+go get code.foilhatguy.casa/pub/version
+```
+2. Add the package as a tool dependency to your project,
+tools.go:
+```go
+// +build tools
+
+package tools
+
+import (
+	_ "code.foilhatguy.casa/pub/version"
+)
+```
+3. In the main package add a go:generate directive:
+```go
+//go:generate go run code.foilhatguy.casa/pub/version
+```
+4. Run code generator by **go generate** command: 
+```shell
+go generate ./...
+```
+The package will detect a version number from the latest git
+tag from your project. Then it will generate a **version.go** 
+file as a part of the main package. It will contain a version
+number as a constant and code for --version flag detection.
+5. Build and run your application with the --version flag.
+```shell
+go run . --version
+```