Docs: Add README

Author: Hayao0819

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README.md

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+<div align="center">
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+# Alter Linux & AlterISO
+
+ArchLinux-derived OS made in Japan aimed at being usable by anyone
+
+<hr>
+
+</div>
+
+## AlterISO 5.0
+
+A build tool inspired by archiso and rewritten in Golang.
+
+It combines flexibility and convenience and is optimized for graphical live environment.
+
+## Alter Linux
+
+Arch Linux GUI environment optimized for the Japanese.