add doc for chlorodb

Former-commit-id: 55fd288275b46bd02170029b9bc683ad34c3c611
Former-commit-id: 329bedc41c4355741a5bbd3f2056ac1025f3da7f

detectors/cds/tools/chlorodb/README.txt

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+#
+# Make chloro DB's for use by CDS prediction program
+#
+
+mkdir myDB
+mkdir myDB/download
+cp GBKorEMBLEntries myDB/download
+[optional
+ cp ORG_HOME/data/cds/chlorodb/parameters.sh myDB
+ <edit> myDB/parameters.sh
+]
+
+go_chlorodb.sh myDB
+
+and... wait... (typical time : 5h for 500 Entries)
+
+then (after checking) 
+
+  mv ORG_HOME/data/cds/chlorodb ORG_HOME/data/cds/chlorodb.old
+  mv myDB ORG_HOME/data/cds/chlorodb
+
+#
+# notes
+#
+
+this requires an installed R > 3.0.1
+
+with the following packages
+
+    igraph          # <- mandatory
+
+    grid            # <- the following are not needed
+    gridExtra       #    by scripts, but just to
+    vcd             #    produce graphics for models
+    plotrix         #    by lib/plot.models.r
+
+you can check and install them by running :
+
+ lib/install.rpackages.r