add readme

README.md

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+```
+                 _-====-__-=-__-===-__-=======-__
+               _(                               _)
+            OO(                                )
+         . o  '===-______-===-____-==-__-====='
+      .o
+     . ______          _______________
+   _()_||__|| __o^o___ | [] [] [] [] |
+  (           |      | |             |o
+ /-OO----OO""="OO--OO"="OO---------OO"
+############################################################
+```
+
+# pfaedle
+
+Precise map-matching for public transit feeds.
+
+## Requirements
+
+ * `cmake`
+ * `gcc`
+ * `libbost-system`, `libbost-filesystem`
+
+## Building and Installation
+
+Fetch this repository and init submodules:
+
+```
+git clone --recurse-submodules https://ad-git.informatik.uni-freiburg.de/ad/pfaedle
+```
+
+```
+mkdir build && cd build
+cmake ..
+make -j
+```
+
+To install, type
+```
+make install
+```
+
+# General Usage
+
+## Generating shapes for an entire GTFS feed
+
+```
+./build/pfaedle -c pfaedle.cfg -x <OSM FILE> <GTFS INPUT FOLDER>
+```
+
+A shape'd version of the input GTFS feed will be written to `./gtfs-out`.
+
+By default, shapes are only calculated for trips that don't have a shape in the
+input feed. To drop all existing shapes, use the `-D` flag.
+
+## Generating shapes for an entire GTFS feed, but only for a specific MOT
+
+To generate shapes only for a specific mot, use the `-m` option. Possible
+values are either `tram`, `bus`, `rail`, `subway`, `ferry`, `funicular`,
+`gondola`, `all`.
+
+Multiple values can be specified (comma separated).
+
+## OSM filtering
+
+`pfaedle` comes with the ability to filter OpenStreetMap data. If you specify
+the `-X` flag, `pfaedle` will filter the input OSM file and output a now OSM
+file which contains *exactly* the data needed to calculate the shapes for the
+input GTFS feed and the input configuration.
+
+This can be used to avoid parsing (for example) the entire world.osm on each
+run.
+
+## Debugging
+
+The following flags may be useful for debugging:
+
+ * `-T` only calculate shape for a single trip and output it as GeoJSON to
+   `<dbg-path>/path.json`
+ * `--write-graph` write the graph used for routing as GeoJSON to
+   `<dbg-path>/graph.json`
+ * `--write-cgraph` if `-T` is set, write the combination graph used for
+   routing as GeoJSON to `<dbg-path>/combgraph.json`
+
+# Configuration
+
+The main config file distributed with this repository is `pfaedle.cfg`. The
+config file has some comments which hopefully explain the meaning behind the
+parameters
+
+# Evaluation
+
+You may run an entire evaluation of our testing datasets Vitoria-Gasteiz and
+Stuttgart with
+
+```
+mkdir build && cd build
+cmake ..
+make -j
+make eval
+```
+
+*Note:* this will download, and filter, the entire OSM files for Spain and the
+Stuttgart region. Make sure you have enough space left on your hard drive.
+
+## Evaluation requirements
+
+ * zlib
+
+On Debianesque systems, type
+
+```
+sudo apt-get install zlib1g-dev
+```
+
+to install the dependencies.
+
+# Known Bugs
+
+None so far \o/