add info

docs/index.rst

@@ -1,6 +1,8 @@
 Fiji
 ====
 
+Fiji is a popular free open-source image processing package based on ImageJ, \ https://imagej.net/Fiji\. We demonstrate how to use Fiji User Interface and OMERO and we also demonstrate how to analyze data in OMERO using Fiji scripting facility.
+
 Contents:
 
 .. toctree::
@@ -9,4 +11,4 @@ Contents:
    installation
    manual_analysis
    threshold_manual
-   threshold_scripting
+   threshold_scripting