added build instructions to readme

README.md

@@ -15,6 +15,27 @@ Muscheln und Schnecken des Museums für Naturkunde Berlin freistellen und neue B
 |master      | [![Build Status](https://travis-ci.com/snailsnap/mosaic.svg?branch=master)](https://travis-ci.com/snailsnap/mosaic) | [![Build status](https://ci.appveyor.com/api/projects/status/5g1x1yk1wvlohao2/branch/master?svg=true)](https://ci.appveyor.com/project/lukaswagner/mosaic/branch/master) |
 |develop     | [![Build Status](https://travis-ci.com/snailsnap/mosaic.svg?branch=develop)](https://travis-ci.com/snailsnap/mosaic) | [![Build status](https://ci.appveyor.com/api/projects/status/5g1x1yk1wvlohao2/branch/develop?svg=true)](https://ci.appveyor.com/project/lukaswagner/mosaic/branch/develop) |
 
+## How to Run
+
+  - Install Qt
+  - Clone it
+  - Initialize submodules (if SmtpClient or JCVoronoi fail to build, you're missing this)
+  - Run CMake
+  - Build it
+  - Place the data folder (containing the snail images, the meta file and the optional descriptions) next to the built executable
+  - Run it
+  - If it doesn't work for some reason, check these steps again, and if it still doesn't work create an issue where you tell [Lukas](https://github.com/lukaswagner) to improve the readme.
+
+## Command Line Arguments
+
+  - Important
+    - `-n` or `--maxNumOfMolluscs` - Number of snails to build the mosaic from. A good value is 7500.
+  - Optional
+    - `-d` or `--data` - Path to the data folder, if it's not placed directly next to the executable.
+    - `-c` or `--useCam` - Whether the camera should be used to capture images. Pass `false` to use a file dialog to open an existing image. Default is `true`.
+  - Unnecessary
+    - `-o` or `--output` - Output of the processed image. Just for debugging.
+
 ## Dependencies
 
   - [Qt](https://www.qt.io/)