I noticed nobody had written how to add gems in the wiki so I just wrote it in myself. There is still more information to be added but this is what I learned so I'm sharing,

Mrbgems-FAQ.md

@@ -9,8 +9,32 @@ In detail, see https://github.com/mruby/mruby/blob/master/doc/mrbgems/README.md
 
 ## How to add mrbgems?
 
-(To be written...)
-
+In mrubys root directory there is a file called build_config.rb that file is where you have your build information. Including the gems you want to add as well as additional information such as included header 
+files and libraries to be linked if your creating your gem with C extensions. Inside the build_config.rb
+You can add this code in to add in your gems.
+```ruby
+conf.gem 'path\to\gem'
+```
+If you want to include an include path you do it by writing the code below in your gem specification inside
+your projects mrbgem.rake file. 
+```ruby
+conf.cc do |cc|
+  cc.include_paths = ''
+end
+```
+Or you may run into a problem where the mruby.h can't be found in that case do this.
+```ruby
+conf.cc do |cc|
+  cc.include_paths = ['path\to\mruby\include', 'path\to\your\include']
+end
+```
+Now if you want to link files you do so like this.
+```ruby
+spec.linker do |linker|
+   linker.library_paths = 'path\to\lib'
+   linker.libraries = ['mingw32', 'foo', 'bar']
+ end
+```
 ## Help! My mruby don't have...
 
 ### Kernel#sleep