Add first draft of docs built with sphinx

docs/installation.md

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+# Installation
+
+This package is not available on any package repositories, but can be installed by cloning the repository from GitHub and installing via ```pip install``` from the root folder:
+
+```
+$ git clone git@github.com:rasmusthog/nafuma.git
+$ cd nafuma
+$ pip install .
+``` 
+If you are planning on making changes to the code base, you might want to consider installing it in develop-mode in order for changes to take effect without reinstalling by including the ```-e``` flag: 
+
+```
+pip install -e .
+```
+
+As of now (v0.2, 08-04-22), the installer will not install any dependencies. It is recommended that you use `conda` to create an environment from `environment.yml` in the root folder:
+
+```
+$ conda env create --name <your_environment_name_here> --file environment.yml
+$ conda activate <your_environment_name_here>
+```
+
+(remember to also get rid of <> when substituting your environment name).
+
+This should get you up and running!