Criteria.md

+Must-have criteria:
+
+* platform independency 
+* printing on Everest-D V4 possible
+* three types of diagrams:
+   * bar
+   * line
+   * scatter
+* linkage to GuiSvgPlott as independent library
+* processable input is CSV
+* two outputs:
+   * Braille preview
+   * printable format
+* extend GuiSvgPlott with a new dialog
+
+
+Nice-to-have criteria:
+
+* 
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