Update readme.md (#153)

Add features section to readme. Advice to use QtCreator on all platforms.

readme.md

@@ -2,16 +2,28 @@
 
 OpenHantek is a free software for Hantek and compatible (Voltcraft/Darkwire/Protek/Acetech) USB digital signal oscilloscopes.
 
-It has started as an alternative to the official Hantek DSO software for Linux users. Nowadays it works under Microsoft Windows and Apple Mac OS as well.
-
 <table><tr>
     <td> <img alt="Image of main window on linux" width="100%" src="docs/images/screenshot_mainwindow.png"> </td>
     <td> <img alt="Image of main window on Windows" width="100%" src="docs/images/screenshot_mainwindow_win.png"> </td>
 </tr></table>
 
-* Supported operating systems: Linux, MacOSX, Windows¹
+* Supported operating systems: Linux, MacOSX, Windows¹, Android
 * Supported devices: DSO2xxx Series, DSO52xx Series, 6022BE/BL
 
+## Features
+
+* Digital phosphor effect to notice even short spikes
+* Voltage and Spectrum view for all device supported chanels
+* Math channel with these modes: Ch1+Ch2, Ch1-Ch2
+* Freely configurable colors
+* Export to CSV, JPG, PNG or print the graphs
+* Supports hardware and software triggered devices
+* A zoom view with a freely selectable range
+* All settings can be saved to a configuration file and loaded again
+* Multiple instances with a different device each can be started
+* The dock views on the main window can be customized by dragging them around and stacking them.
+  This allows a minimum window size of 640*480 for old workstation computers.
+
 ## Install prebuilt binary
 Navigate to the [Releases](https://github.com/OpenHantek/openhantek/releases) page 
 
@@ -21,14 +33,17 @@ You need the following software, to build OpenHantek from source:
 * [Qt 5.4+](https://www1.qt.io/download-open-source/)
 * [FFTW 3+ (prebuild files will be downloaded on windows)](http://www.fftw.org/)
 * libusb 1.x (prebuild files will be used on windows)
-
-You need a OpenGL 3.x capable graphics card for OpenHantek.
+* A compiler that supports C++11
 
 We have build instructions available for [Linux](docs/build.md#linux), [Apple MacOSX](docs/build.md#apple) and [Microsoft Windows](docs/build.md#windows).
 
 ## Run OpenHantek
-Please be aware that you need USB access permissions. As seen on the [Microsoft Windows build instructions](docs/build.md#windows) page, you need a
-special driver for Windows systems. On Linux, you need to copy the file `firmware/60-hantek.rules` to `/lib/udev/rules.d/` and replug your device.
+You need a OpenGL 3.0+ or OpenGL ES 2.0+ capable graphics hardware for OpenHantek.
+
+USB access for the device is required:
+* As seen on the [Microsoft Windows build instructions](docs/build.md#windows) page, you need a
+special driver for Windows systems.
+* On Linux, you need to copy the file `firmware/60-hantek.rules` to `/lib/udev/rules.d/` and replug your device.
 
 ## Specifications, Features and limitations
 Please refer to the [Specifications, Features, Limitations](docs/limitations.md) page.
@@ -42,6 +57,7 @@ We welcome any reported Github Issue if you have a problem with this software. S
      (install clang-format. Use make target: `make format` or execute directly from the openhantek directory: `clang-format -style=file src/*`).
    - Open a [pull request][12] with a clear title and description.
    - Read [Add a new device](docs/adddevice.md) if you want to know how to add a device.
+   - Do as a favour and use QtCreator as IDE on all platforms. It comes with CMake support, a decent compiler, and Qt out of the box.
 
 [10]: http://gun.io/blog/how-to-github-fork-branch-and-pull-request
 [11]: http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html