Added the installation tutorial

INSTALLATION.md

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+# A detailed installation process of DeepKnee
+Tested on a fresh Ubuntu 18.04 LTS
+
+## Installing Docker
+
+1. Install the pre-requisites for `apt` and get the repository added to your list of repositories.
+```
+sudo apt update
+sudo apt install -y apt-transport-https ca-certificates curl software-properties-common
+curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
+sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
+sudo apt update
+```
+Please note that if you use Linux Mint (also Ubuntu based), you might need to add the repo this way.
+You need to replace the last two lines in the above script.
+
+```
+echo -e "\ndeb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable" | sudo tee -a /etc/apt/sources.list
+sudo apt update
+```
+
+2. Installing docker and checking that it works
+```
+sudo apt install -y docker-ce
+sudo docker run hello-world
+```
+
+The lines above will install the docker itself and will also run the test `hellow-world` container.
+
+3. Making sure that docker can be executed w/o root:
+```
+sudo usermod -aG docker ${USER}
+newgrp docker 
+```
+
+4. Install docker-compose. The easiest path is to use anaconda:
+```
+cd
+wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O ~/miniconda.sh
+chmod +x miniconda.sh
+./miniconda.sh
+```
+
+Note: if you use zsh instead of bash, you need to modify your `.zshrc` in order to proceed by adding the following at the end of the file:
+
+```
+# >>> conda initialize >>>
+# !! Contents within this block are managed by 'conda init' !!
+__conda_setup="$('/home/lext/miniconda3/bin/conda' 'shell.bash' 'hook' 2> /dev/null)"
+if [ $? -eq 0 ]; then
+    eval "$__conda_setup"
+else
+    if [ -f "/home/lext/miniconda3/etc/profile.d/conda.sh" ]; then
+        . "/home/lext/miniconda3/etc/profile.d/conda.sh"
+    else
+        export PATH="/home/lext/miniconda3/bin:$PATH"
+    fi
+fi
+unset __conda_setup
+# <<< conda initialize <<<
+```
+
+Exit your terminal and open it again. Now you should have a `base` conda environment activated.
+Install docker-compose:
+
+```
+pip install docker-compose
+```
+5. Install DeepKnee (has to be run in the root of this repo):
+```
+sh deploy.sh cpu
+```