README.md file is added.

README.md

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+### The "UI" package
+
+This package provides --verbose and --quiet flag features to your cli.
+It recognize both short and long flags. The package contains three functions:
+- **PrintOut** to print regular messages unless --quiet flag is set.
+- **PrintVerbose** to print messages only if --verbose flag is set, but --quiet
+flag is not.
+- **SetupOutputMode** to reconfigure output mode in the runtime.
+
+-------------
+
+### Usage
+1. Download the package by **go get** command:
+```shell
+go get code.foilhatguy.casa/pub/ui
+```
+2. Import package to your golang code:
+```go
+import (
+	"code.foilhatguy.casa/pub/ui"
+)
+```
+There is no need for additional configuration. The package have its own **init** 
+function to detect --verbose and --quiet flags.
+3. Use **PrintOut** and **PrintVerbose** functions to print
+messages to the standard output:
+```go
+    ui.PrintOut("Some regular message.")
+    ui.PrintVerbose("Some message printed only if --verbose flag is set.")
+```