Add a "why choose Recoil" guide.

doc/site/guides/choose-recoil.markdown

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+---
+layout: post
+title: Choose Recoil
+parent: Guides
+permalink: guides/choose-recoil
+author: sprunk
+---
+
+## Choose Recoil!
+
+Picking the engine for your game is a very important decision to make.
+Here's how Recoil compares to other choices.
+
+### Why shouldn't I pick a general engine (Unity, Godot, etc)?
+ * Recoil has **built-in multiplayer RTS facilities**.
+This means systems such as pathfinding, targeting, the concept of unit commands, projectile physics, resource system, networking and synchronisation, replays, and many others.
+With general engines you'd need to bother integrating these yourself.
+ * Recoil **embraces open-source**.
+The engine is both free and welcoming to modification.
+The GPL license means that Recoil games can always share code with each other, though you can still make a successful commercial game: content/assets such as models and maps, or access to your servers, can remain proprietary.
+ * Recoil **is a platform**.
+There's a community of veteran RTS enthusiasts around the project that will gladly help you start out.
+Host your budding game on existing servers, reuse existing content, don't worry about issues such as distribution and marketing until your game is mature enough to take them on.
+
+### My game is heavily inspired by some existing game XYZ, why shouldn't I just mod it?
+ * Recoil **is an open-source platform**, see above.
+ * Recoil is **built with modding in mind**.
+Most commercial games require you to put in some effort to replace content, and often it is not possible to replace some deeper mechanics without major hackery.
+Meanwhile Recoil exposes interfaces for you to do everything you want.
+
+### I'm making a little Starcraft style mod. Why shouldn't I just use SC2 Arcade? It's also a platform for mods.
+ * well, perhaps you should! Recoil is oriented towards Total Annihilation style games, and SC2 is still a great platform for modding. **However:**
+ * Recoil is **constantly being developed**.
+Improvements and features are being added over time.
+If your game finds a feature missing you can talk to engine developers who will be glad to try and accomodate your needs.
+ * Recoil doesn't interfere with your **ownership of content**.
+Code has to be open-sourced, but full ownership of content is still yours, not Blizzard's.