Having Isuses adding this package into existing Unity project

[tahmidrafi]

I am trying to import this package in my existing project. I did Window -> Package Manager -> Add Package from git URL. Unity console says,

[Package Manager Window] Cannot perform upm operation: Unable to add package [https://github.com/JimmyCushnie/FancyTextRendering.git]:
  [https://github.com/JimmyCushnie/FancyTextRendering.git] does not point to a valid package. No package manifest was found. [NotFound].
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()

and

[Package Manager Window] Error adding package: https://github.com/JimmyCushnie/FancyTextRendering.git.
UnityEditor.EditorApplication:Internal_CallUpdateFunctions ()

What am I doing wrong?

[NemesisTWarlock]

Pretty sure this project doesn't support that, though I could be wrong.

Best bet is to install NaughtyAttributes and JimmysUnityUtilities seperately, download the project as a zip file, and unzip the /Assets/FancyTextRendering folder into your existing project.