Improve & document testing changes (#22)

* Add instructions to test changes

* Simplify setup using `DevAuth` system properties

* Minor wording fix

* Use the `Minecraft Client` run configuration

* Better formatting, link Fabric docs

* Can also use `ideaSyncTask`

* Don't remove trailing spaces from markdown files

.editorconfig

@@ -32,3 +32,6 @@ indent_size = 2
 [.editorconfig]
 indent_style = space
 indent_size = 4
+
+[*.md]
+trim_trailing_whitespace=false

CONTRIBUTING.md

@@ -2,3 +2,13 @@ Contribution to Denizen
 -----------------------
 
 Refer to the Denizen contribution guide: https://github.com/DenizenScript/Denizen/blob/dev/CONTRIBUTING.md
+
+## Testing changes
+
+The instructions below are targeted at the `Intellij IDEA` IDE, although the process should be similar for most IDEs.  
+You will be using the `Minecraft Client` run configuration to run a Minecraft client with Clientizen from within your IDE; as the client that runs does not include authentication by default, Clientizen makes use of the `DevAuth` mod to enable that.  
+Go into your IDE, select the `Minecraft Client` run configuration from the run menu at the top bar (if it's missing, restart your IDE or run the `ideaSyncTask` Gradle task), and press run.  
+Note the run terminal opening below, where `DevAuth` will output a link for you to authenticate your Microsoft account.  
+You should only need to do that once (and after the token expires, which seems to be about 90 days according to the `DevAuth` developer), after that you will be able to simply run the `Minecraft Client` run configuration to start a Minecraft client with Clientizen.
+
+For more information regarding setup in specific IDEs, preferred settings, and generating & reading Minecraft sources, see [Fabric's docs](https://fabricmc.net/wiki/tutorial:setup#intellij_idea).

build.gradle

@@ -43,6 +43,15 @@ dependencies {
     modRuntimeOnly("me.djtheredstoner:DevAuth-fabric:${project.devauth_version}")
 }
 
+loom {
+    runs {
+        client {
+            property("devauth.enabled", "true")
+            property("devauth.account", "alt") // DevAuth's name for the Microsoft account in the default config
+        }
+    }
+}
+
 
 processResources {
     inputs.property "version", version