Update readme with build instructions

README.md

@@ -3,4 +3,42 @@ SEGYVIEWER
 =======
 
 Segyviewer is a small LGPL licensed python library for easy viewing of SEG-Y
-files. It uses the segyio library for reading files.
+files. It uses the segyio library for reading files.
+
+## Getting started ##
+
+Segyviewer is available through pip and installed with
+
+```bash
+pip install segyviewer
+```
+
+to open segyviewer with your chosen <file.segy>
+```bash
+segyviewer <file.segy>
+```
+
+## Build Segyviewer
+
+To build segyviewer you need:
+
+ * [Python](https://www.python.org/) 2.7 or 3.x.
+ * [numpy](http://www.numpy.org/) version 1.10 or greater
+ * [setuptools](https://pypi.python.org/pypi/setuptools) version 28 or greater
+ * [setuptools-scm](https://pypi.python.org/pypi/setuptools_scm)
+ * [PyQt4](https://www.riverbankcomputing.com/software/pyqt/download)
+ * [segyio](https://github.com/Statoil/segyio)
+ * [matplotlib](https://matplotlib.org/)
+
+To build and install segyviewer, perform the following actions in your console:
+
+```bash
+git clone https://github.com/Statoil/segyviewer
+cd segyviewer
+python setup.py build
+python setup.py install
+```
+
+Please note that the required library pyqt4 is not listed in requirements.txt. QT not longer
+supports PyQt4 and as such it is not possible to pip install PyQt4.
+Setup.py, which uses pip, would fail if PyQt4 was listed in requirements.txt.