update README

README.md

@@ -6,4 +6,25 @@
 [![Coverage](https://codecov.io/gh/JuliaTrustworthyAI/TaijaParallel.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/JuliaTrustworthyAI/TaijaParallel.jl)
 [![Code Style: Blue](https://img.shields.io/badge/code%20style-blue-4495d1.svg)](https://github.com/invenia/BlueStyle)
 
-This package adds custom support for parallelization for certain [Taija](https://github.com/JuliaTrustworthyAI) packages.
+This package adds custom support for parallelization for certain [Taija](https://github.com/JuliaTrustworthyAI) packages.
+
+## Installation
+
+The stable version of this package can be installed as follows:
+
+``` julia
+using Pkg
+Pkg.add("TaijaParallel.jl")
+```
+
+The development version can be installed like so:
+
+``` julia
+using Pkg
+Pkg.add("https://github.com/JuliaTrustworthyAI/TaijaParallel.jl")
+```
+
+## Usage
+
+Since this package extends the functionality of other Taija packages, it should be used in combination with those packages. For example, see this [tutorial](https://juliatrustworthyai.github.io/CounterfactualExplanations.jl/v0.1/tutorials/parallelization/) to see how `TaijaParallel.jl` can be used with `CounterfactualExplanations.jl`.
+