games: add resources for gw2

wiki/games/guild_wars_2.md

@@ -3,6 +3,29 @@
 [Guild Wars 2](https://www.guildwars2.com) is a MMORPG [game](/wiki/games.md) which is available as
 a standalone Launcher for Windows and on [Steam](./steam.md).
 
+## Resources
+
+There are many useful resources.
+The following list provides a select few of them.
+
+- [Craft To Gold](https://www.gw2craftgold.com/) analyzes crafting items to sell on the trading
+  post.
+- [\[fast\] Farming Community](https://fast.farming-community.eu/) is a guild that provides many
+  useful trackers for items, dailies and more.
+- [Guildwars 2 Wiki](https://wiki.guildwars2.com/wiki/Main_Page) is the official wiki.
+- [GW2BLTC](https://www.gw2bltc.com) is for playing the trading post.
+- [GW2Crafts](https://gw2crafts.net/)  provides guides to level crafting.
+- [GW2TP](https://www.gw2tp.com/) analyzes the trading post.
+- [Hardstuck](https://hardstuck.gg/gw2/builds/) provides guides but is most useful for its builds.
+  Especially the PvP builds are good and well maintained.
+- [killproof.me](https://killproof.me/) provides killproof for raids or strikes.
+  It is also available as [add-on](#killproofme).
+- [MetaBattle](https://metabattle.com/wiki/MetaBattle_Wiki) provides guides and builds.
+  Another interesting page of it is the best
+  [spending of WvW points](https://metabattle.com/wiki/Guide:How_to_spend_WvW_Ability_Points).
+- [Snowcrows](https://snowcrows.com/builds) is a guild that provides guides and builds that are
+  especially well suited for instanced PvE content.
+
 ## Add-ons
 
 Guild Wars 2 features a large add-on community.