too many shell scripts in the code's root directory #46

Wanted to log this issue to get feedback from others before making any changes since a new (or not new) user might be confused by all the shell scripts

Proposed changes

Create "util" directory in root
move "run-after-build.sh" to util
move "install.sh" to util
Update README.md to let users know about these scripts
Optionally create a separate README.me in "util" directory to explain wtf the scripts do

From #36

I would like to keep run-after-build.sh since I use it to automate the running of SDL after a successful compile, which is slightly different.

If you move install.sh you need to move a SilentDragonLite.desktop file as well, and to run install.sh properly you will have to cd into util directory to mv SilentDragonLite.desktop into ~/.local/share/applications, I personally don't use it but it is much easier for people to launch SDL by clicking the SDL logo.

This is how the SDL installation process is look like for users:

git clone https://git.hush.is/hush/SilentDragonLite.git && cd SilentDragonLite/ && ./install.sh

Assume the only thing that will change is cd SilentDragonLite/util, I'm OK with that.

K, from #36 we keep "run-after-build.sh" in the root.

I added more for the .desktop file as this currently exists in the SDL AUR package since a user asked for it a while back. The "Version=1.0" line corresponds to the Desktop Entry Specification documentation. I created these for Arch users for both SilentDragon and SDL

Util dir created
moved "install.sh" script to util