adding installation method for mac via pipenv

source/components/software/nk-app2/installation_mac.rst

@@ -0,0 +1,41 @@
+macOS Install
+===========
+
+Pipenv
+------
+
+This is the simplest way for now to install the Nitrokey App 2 on macOS. Further methods are being worked on.
+
+1. `Install <https://pipenv.pypa.io/en/latest/installation.htm>`__  Pipenv if it is not already installed.
+2. Create a work directory
+
+code-block::
+
+ mkdir nitrokeyapp
+
+3. Enter the directory 
+code-block::
+
+ cd nitrokeyapp
+4. Install the app via pipenv 
+code-block::
+
+ pipenv install nitrokeyapp
+
+The app can be updated the following way
+
+1. Enter the work directory 
+code-block::
+
+ cd nitrokeyapp
+2. pipenv update
+
+To run the application, go into the workdirectory 
+code-block::
+
+ cd nitrokeyapp 
+
+and run 
+code-block::
+
+ pipenv run nitrokeyapp.