Feature/fix build deps

[danielt3]

This adds instructions about how to install build dependencies in Debian 10 systems. Please, review and make your comments.

Thank you.

[Semphriss]

• Some libraries (such as SDL2 and libcurl4 are missing, and the sudo apt install's are redundant. Please check this line for reference: sudo apt-get update && sudo apt-get install -y cmake build-essential libogg-dev libvorbis-dev libopenal-dev libboost-all-dev libsdl2-dev libsdl2-image-dev libfreetype6-dev libraqm-dev libcurl4-openssl-dev libglew-dev libharfbuzz-dev libfribidi-dev
• Please don't make an entire section just for that; put it at the end of the preceeding section instead, with an introduction like "For ease of use, here are some installation lines for some Linux distributions:" and if the line given above works without edit, please specify it works for both Debian and Ubuntu.

[danielt3]

Thank you for your help and comments. Answers inline.

* [ ]  Some libraries (such as SDL2 and libcurl4 are missing, and the `sudo apt install`'s are redundant. Please check this line for reference: `sudo apt-get update && sudo apt-get install -y cmake build-essential libogg-dev libvorbis-dev libopenal-dev libboost-all-dev libsdl2-dev libsdl2-image-dev libfreetype6-dev libraqm-dev libcurl4-openssl-dev libglew-dev libharfbuzz-dev libfribidi-dev`

Thank you for your comments. I will add as one single line as you specified. Also, I don't recommend using -y on other people's machines. Can I remove it?

* [ ]  Please don't make an entire section just for that; put it at the end of the preceeding section instead, with an introduction like "For ease of use, here are some installation lines for some Linux distributions:" and if the line given above works without edit, please specify it works for both Debian and Ubuntu.

OK, will do so for the section. For specifying it works for Debian and Ubuntu, I don't own an Ubuntu machine and I didn't tested it running in Ubuntu. This is why I didn't mention it. Can I just put a message like: "These were not tested in Ubuntu but they are likely to work."?

[tobbi]

Is this good to go?