add appendix A file

appA.jl

@@ -0,0 +1,61 @@
+# Bogumił Kamiński, 2021
+
+# Codes for appendix A
+
+# As opposed to all other files in this repository in the presented codes I
+# do not assume that you have activated the project from the repository folder.
+# Instead, please follow the instructions contained in the appendix A.
+
+# starting Julia session
+
+julia
+
+# exiting Julia session
+
+exit()
+
+# getting help
+
+?&&
+
+# setting up the project environment for working with examples in the book
+# D:\\JuliaForDataAnalysis is an example folder
+
+cd("D:\\JuliaForDataAnalysis")
+isfile("Project.toml")
+isfile("Manifest.toml")
+# switch to package manager mode by pressing ]
+activate .
+instantiate
+# exit package manager mode by pressing backspace
+
+# activating project environment in a given folder
+activate D:\\JuliaForDataAnalysis\\
+
+# setting up a new project folder
+
+pwd()
+# press ]
+activate .
+status
+add BenchmarkTools
+status
+update
+remove BenchmarkTools
+status
+
+# setting up integration with Python
+
+# make sure you are in package manager mode
+add PyCall
+# press backspace
+using PyCall
+PyCall.python
+
+# setting up integration with R
+
+# make sure you are in package manager mode
+add RCall
+# press backspace
+using RCall
+RCall.Rhome