Note cache directory

Author: code-asher

CONTRIBUTING.md

@@ -13,12 +13,13 @@ There are two ways to get into a workspace:
 
 ## Development
 
-You can get the latest build of Toolbox with Gateway support from our shared 
+You can get the latest build of Toolbox with Gateway support from our shared
 Slack channel with JetBrains. Make sure you download the right version (check
 [./gradle/libs.versions.toml](./gradle/libs.versions.toml)).
 
 To load the plugin into Toolbox, close Toolbox, run `./gradlew build copyPlugin`,
-then launch Toolbox again.
+then launch Toolbox again. If you are not seeing your changes, try copying the
+plugin into Toolbox's `cache/plugins` directory instead of `plugins`.
 
 To simulate opening a workspace from the dashboard you can use something like
 `xdg-open` to launch a URL in this format:
@@ -42,7 +43,7 @@ Run tests with `./gradlew test`. By default this will test against
 `https://dev.coder.com` but you can set `CODER_GATEWAY_TEST_DEPLOYMENT` to a URL
 of your choice or to `mock` to use mocks only.
 
-Some investigation is needed to see what options we have for testing code 
+Some investigation is needed to see what options we have for testing code
 directly tied to the UI, as currently that code is untested.
 
 ## Releasing