gw2: added addon guide

wiki/games/guild_wars_2.md

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+# Guild Wars 2
+
+[Guild Wars 2](https://www.guildwars2.com) is a MMORPG which is available as
+a standalone Launcher for Windows and on [Steam](./steam.md).
+
+## Addons
+
+Guild Wars 2 features a large addon community.
+All addons described in this guide will assume
+[gw2-addon-loader](#gw2-addon-loader) is already installed.
+It has to be set up first if not already done.
+
+### gw2-addon-loader
+
+To make multiple addons work together an addon loader is recommended.
+One optiuon for thi is
+[gw2-addon-loader](https://github.com/gw2-addon-loader/loader-core).
+
+Download the current version from the
+[releases page](https://github.com/gw2-addon-loader/loader-core/releases).
+Proceed to place the files in the Guild Wars 2 Directory according to the
+installation instruction.
+This files namely include the following:
+
+- `gw2_root_directory/addonLoader.dll`
+- `gw2_root_directory/d3d11.dll`
+- `gw2_root_directory/dxgi.dll`
+- `gw2_root_directory/bin64/d3d9.dll`
+
+This addon loader loads both DX9 and DX11 addons.
+For the functionality to work [d3d9_wrapper](#d3d9wrapper) should be installed
+aswell.
+
+### d3d9_wrapper
+
+[d3d9_wrapper](https://github.com/gw2-addon-loader/d3d9_wrapper) is a wrapper
+to the d3d9 API that includes d3d9 loading.
+
+Download the current version from the
+[releases page](https://github.com/gw2-addon-loader/d3d9_wrapper/releases).
+From there place the included Directory
+`d3d9_wrapper/gw2addon_d3d9_wrapper.dll` in Guild Wars 2
+`gw2_root_directory/addon` directory.
+
+### arcdps
+
+[arcdps](https://www.deltaconnected.com/arcdps/) is a damage meter.
+
+Download the file `d3d11.dll` from
+[their website](https://www.deltaconnected.com/arcdps/x64/).
+Then rename it to `gw2addon_arcdps.dll` and move it to a newly created
+directory inside the Guild Wars 2 addon directory
+`gw2_root_directory/addons/arcdps/gw2addon_arcdps.dll`.
+
+### gw2radial
+
+[gw2radial](https://github.com/gw2-addon-loader/GW2Radial) is a addon for Guild
+Wars 2 that allows faster access to markers, mounts and novelties.
+
+Download the current version from the
+[releases page](https://github.com/gw2-addon-loader/GW2Radial/releases).
+Then place the folder `gw2radial_d3d9` which contains the file
+`gw2addon_gw2radial_d3d9.dll` in the addon directory of Guild Wars 2
+`gw2_root_directory/addons`.