Add faq with launch on boot instructions

FAQ.md

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+# Frequently Asked Questions
+
+This document might contain answers to your questions regarding ofxPiMapper and life in general.
+
+## 1. How to launch ofxPiMapper on boot?
+
+It depends whether you are using the addon example or are integrating ofxPiMapper into your application. In both cases you will have to run `make` to compile the binary.
+
+### 1.1. Compile
+
+Make sure that you understand whether you are using the example or building your own. Use `cd` to navigate to your project directory on the Raspberry Pi. In case you are using the example, the command to use should be similar to the following.
+
+```bash
+cd /home/pi/openFrameworks/addons/ofxPiMapper/example
+```
+
+Compile. Run the following command to do that.
+
+```bash
+make
+```
+
+The compiled binary of the application should appear in the `bin` directory of the project. Run the following command to launch the application.
+
+```bash
+/home/pi/openFrameworks/addons/ofxPiMapper/example/bin/example
+```
+
+### 1.2. Set up auto login
+
+Edit the `inittab` file of your system.
+
+```bash
+sudo nano /etc/inittab
+```
+
+Replace the line `1:2345:respawn:/sbin/getty 115200 tty1` with the one below.
+
+```bash
+1:2345:respawn:/bin/login -f pi tty1 /dev/tty1 2>&1
+```
+
+### 1.3. Create a startup script
+
+Execute the following commands one by one.
+
+```bash
+cd /home/pi
+touch startup.sh
+chmod a+x startup.sh
+```
+
+Open `startup.sh` in a text editor.
+
+```bash
+nano startup.sh
+```
+
+Copy and paste the following lines there.
+
+```bash
+#!/bin/bash
+
+echo "Checking SSH connection...";
+if [ -z "$SSH_CONNECTION" ]; then
+  echo "No SSH connection, launching scripts.";
+
+  # Launch the ofxPiMapper example compiled binary fullscreen
+  /home/pi/openFrameworks/addons/ofxPiMapper/example/bin/example -f
+else
+  echo "SSH connection, nothing to be launched.";
+fi
+```
+
+### 1.4. Launch `startup.sh` on auto login
+
+Open `.bashrc` in a text editor.
+
+```bash
+cd /home/pi
+sudo nano .bashrc
+```
+
+At the end of the `.bashrc` file add the path to the `startup.sh` file.
+
+```bash
+/home/pi/startup.sh
+```
+
+Restart your Pi and your application should be launched automatically.
+
+### 1.5. Preventing the screen from going blank
+
+It might happen that the screen goes blank as the system tries to save energy as there is no mouse or keyboard connected. To avoid this from happening, open `rc.local` in a text editor.
+
+```bash
+sudo nano /etc/rc.local
+```
+
+Add the following just **BEFORE** the `exit 0` line.
+
+```bash
+sh -c 'setterm -blank 0 -powersave off -powerdown 0 < /dev/console > /dev/console 2>&1'
+```
+