add editor setup tips to contrib guide

CONTRIBUTING.md

@@ -112,14 +112,22 @@ Cats cross-compiles to both JVM and Javascript(JS). If you are not used to
 working with cross-compiling builds, the first things that you will notice is that
 builds:
 
- * Will take longer: To build JVM only, just use the `catsJVM`, or `catsJS` for
-
- JS only. And if you want the default project to be `catsJVM`, just copy the
-   file `scripts/sbtrc-JVM` to `.sbtrc` in the root directory.
+ * Will take longer: To build JVM only, just use the `catsJVM`, or `catsJS` for JS only. 
+   And if you want the default project to be `catsJVM`, just copy the file `scripts/sbtrc-JVM` to `.sbtrc` in the root directory.
 
  * May run out of memory: We suggest you use
    [Paul Philips's sbt script](https://github.com/paulp/sbt-extras) that will use the settings from Cats.
 
+### Editor Setup Tips
+
+**IntelliJ** 
+
+- Be warned, IntelliJ is currently not 100% accurate at reporting compilation errors, there *will* be cases that it reports errors incorrectly. If you simply don't want to see the errors, a quick an easy work around is to disable *Type-Aware Highlighting* by clicking the `[T]` icon in the bottom toolbar.
+
+- There is an open [issue](https://github.com/typelevel/cats/issues/2152) with the IntelliJ scala plugin, which prevents it from configuring similacrum correctly when importing the cats project. The work around for this issue is to set `val CompileTime = Provided` in `build.sbt`. Note: Be careful not to commit this change. 
+
+- IntelliJ does have [support](https://blog.jetbrains.com/scala/2015/07/31/inline-refactoring-for-type-aliases-and-kind-projector-support/) for kind-projector. However, it is not always seamless. If you are unable to get IntelliJ to recognise the special symbols that kind-project provides, such as `?` `Lambda[X => G[F[A]]]` or `λ[X => G[F[A]]]` try upgrading to the early access preview (EAP) version of the scala plugin. This can be done under `Settings > Languages & Frameworks > Scala > Updates`
+
 ### Write code
 
 [See guidelines](/cats/guidelines.html).