Added Docs/Readme

SetupEnv.md

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+# Setting up build environment
+The packages will be built with architecture of build system.
+
+## Requirements
+To build a package for Alpine Linux you need an Alpine Linux installation. (For more info see: https://wiki.alpinelinux.org/wiki/Installation)
+## Setup
+### Install requirements
+```
+apk add alpine-sdk sudo git
+```
+### Setup user account
+This is needed since `abuild` refuses to run as root.  
+```
+adduser <yourusername>
+addgroup <yourusername> abuild
+```
+Add the following to the sudoers file `/etc/sudoers` using the `visudo` command.
+```
+<yourusername>    ALL=(ALL) ALL
+```
+### Set file permissions
+```
+chgrp abuild /var/cache/distfiles
+chmod g+w /var/cache/distfiles
+```
+### Generating key for signing packages
+Login as the newly created user, then run the following command.
+```
+abuild-keygen -a -i
+```
+* -a Will set `PACKAGER_PRIVKEY` to the generated key, this is for signing the packages
+* -i Will install the key in to the `apk` package manager (/etc/apk/keys)
+## Source
+https://wiki.alpinelinux.org/wiki/Creating_an_Alpine_package