Update the README to include Mac and Linux

README.md

@@ -2,9 +2,8 @@
 
 GpxUi is a graphical user interface wrapped around GPX, a command line utility.
 
-It is Window only at the moment, but I made it with Qt with the intention of building
-it for other platforms. I don't have a Mac, but I've got Linux, so if there is interest
-I'll make a linux version.
+Should work on Windows (test on Windows 10), Mac (tested on El Capitan) and
+Linux (tested on Kubuntu 15 and 16).
 
 GPX is a post processing utility for converting gcode output from 3D slicing
 software like Cura, KISSlicer, S3DCreator and Slic3r to x3g files for standalone
@@ -16,25 +15,44 @@ settings editor and setup program to make it easy to get GPX set up and running
 with the right settings. Also includes a machine settings editor so you can mess
 with arcane stuff like how many steps per mm.
 
-## Installing and running
+## Installing
 
-  1. Download and run setup.exe from the [releases](https://github.com/markwalGpxUi/releases/latest) page
-  2. Choose your printer type
-  3. Choose the gcode flavor of the slicer you want to use
-  4. Click "Save" to save those two settings into gpx.ini
-  5. Click the translate button, it'll ask for the name of the gcode file and
-     the name of the output x3g file
+### Windows
+
+  1. Download and run setup.exe from the [releases](https://github.com/markwal/GpxUi/releases/latest) page
+
+### Mac
+
+  1. Download a GpxUi.dmg from the [releases](https://github.com/markwal/GpxUi/releases/latest) page
+  2. Open the GpxUi.dmg file and drag the GpxUi app to your Applications folder
+  3. Run GpxUi from the Launcher
+
+### Linux
+
+  1. Build it from source (instructions below) and do `make install`
+  2. run "GpxUi"
+
+## Running
+
+  1. Choose your printer type
+  2. Choose the gcode flavor of the slicer you want to use
+  3. Click "Save" to save those two settings into gpx.ini
+  4. Click the translate button, it'll ask for the name of the gcode file and the name of the output x3g file
 
 ## Notes
 
 The setup added gpx.exe to your path, so you can easily add it as a post
 processor to Slic3r:
 
-  1. Put Slic3r into expert mode via File.Preferences from the menu bar and
-     restart Slic3r
+  1. Put Slic3r into expert mode via File.Preferences from the menu bar and restart Slic3r
   2. Choose "Print Settings" tab, "Output options" panel
-  3. In "Post-processing scripts" type "gpx.exe" all by itself without quotes
-     or parameters
+  3. In "Post-processing scripts" type "gpx.exe" all by itself without quotes or parameters
+
+### Mac Note
+
+  * Replace step 3 with: In "Post-processing scripts" type "/Application/GpxUi.app/Contents/MacOS/gpx"
+
+### Windows Notes
 
 It added to the end of your path, so if you have a gpx.exe somewhere else on
 your machine and on your path, it won't read the settings you set in GpxUi because
@@ -56,7 +74,6 @@ Help.Updates... menu.
 
 ## Future features
 
-  - As I mentioned, perhaps other platforms
   - Have setup connect gpx.exe to the right-click on gcode files menu so you
     can right-click on a gcode file and choose "Convert to x3g"
   - A warning when it notices another gpx.exe earlier on the path
@@ -81,6 +98,7 @@ Help.Updates... menu.
 4. `make` for the debug build or `make release` for the optimized build
 
 For Windows setup.exe: `make squirrel.windows`
+For Mac dmg: `make macdeployqt CODESIGNID="signature name"`
 
 ## Ubuntu build instructions
 
@@ -89,3 +107,4 @@ For Windows setup.exe: `make squirrel.windows`
 3. Install qt5 tools and libraries `sudo apt-get install qttools5-dev-tools
    qtbase5-dev`
 4. `make` for the debug build or `make release` for the optimized build
+5. `make install`