Readme.md, first lines

README.md

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+# AFM_thumbs.py
+
+## Introduction
+
+The python program AFM_thumbs creates a pdf file, which shows all SPM
+(Scanning Probe Microscopy: like AFM, STM, KPFM, etc.) images and relevant
+data stored in a directory. In first place, AFM_thumbs is interesting for
+scientists, who would like to obtain an overview of their SPM data.
+
+## Supported SPM data
+
+- Omicron SCALA
+- Nanonis
+- RHK
+- Nanotec Dulicinea