Added installation instructions and usage

README.md

@@ -1,2 +1,29 @@
 # Arbench
 Annotation for robotics bench. A FreeCAD workbench for annotating frames of interest, exporting these w.r.t. the part frame, and exporting part information.
+
+# Installation instructions
+This workbench uses freecad 0.16 so far.
+
+0. If you're on ubuntu 14.04, you have to run: `sudo add-apt-reposityory ppa:freecad-maintainers/freecad-stable` then `sudo apt-get update`,
+1. Install FreeCAD 
+`sudo apt-get install Freecad`
+2. Custom workbenches are located in `.FreeCAD/Mod/` under your home directory
+`cd ~/.FreeCAD/Mod/`
+3. Either
+   - Clone the repository there
+   - symlink the cloned repo in there
+4. Start the workbench by
+   1. Run FreeCAD
+   2. Open a STEP file
+   3. Open the `ARBench` workbench
+
+# Usage
+
+1. Click a small feature e.g. a circle
+2. Press the feature frame creator (cone with a magnifying glass on it icon)
+3. Chose type of feature to create
+4. Chose feature parameters if relevant and the offset of the frame from the feature.
+5. Repeat 4 for each feature you want on each part
+6. Click a part and press the export to json button (block->textfile icon)
+7. Save json
+8. Use the json with whatever you want. E.g. `part_frames_publisher`.