Write documentation on packaging own game

[luttje]

Developers will want to compile the engine and package their own game. We should write some docs on how they can do that.

Some notes:

1. Fill .env with path to source sdk 2013
2. Copy source sdk 2013 content and binaries using tools/prepare-standalone-game.sh
3. Ensure the project is built after copying the binaries (so custom dll's overwrite source engine dll's)
4. Place gamemodes, addons, scripts and menu files into game/experiment
5. Test and package the game

[luttje]

Additional notes on distribution/packaging as previously envisioned (open to discussion and changes):

• Consider how the mod-portal ties into this

My original idea for the mod portal:
To serve as an API where the game will download customization settings from, so users can select a mod through a mod picker (out-of-game) and boot into it with ease. Mods could also choose to package their own distribution which includes all the files, bypassing the mod portal. Read how this would conceptually work here: https://experiment-games.github.io/experiment-source/general/distributing-your-game/

The main motivation for the mod portal was to generate some form of income for the project by providing the service of hosting mod files. That cash inflow could then be used to pay developers to continue work on Experiment Source. I believe bypassing the mod portal should always be an option to those who want to self-host their mod files.

Now its pretty early days to think about ways to fund the project, but seeing as I'm not actively working on Experiment Source the past few months: it can't hurt thinking about a way to pay/motivate developers to work on it alongside me.

Further things to consider regarding the mod platform:

• What advantages would the mod portal bring over other mod platforms?
• Is it really worth it? Or is it just more things to work on, spreading limited developer resources thinner than needed?
• Are there alternative options we could consider, like:
  • No cash inflow, just waiting for willing developers to contribute their time and efforts
  • Accepting donations