Start README for workflow

tools/utils/cat/example_usage/config.yaml

@@ -10,4 +10,4 @@ samples:
 - test_00002
 
 cat:
-  name_merge: all.emapper.seed_orthologs 
+  name_merge: all.emapper.seed_orthologs

workflows/eggnogmapperv2/README.md

+# EggNOG mapper v2
+
+This describes a workflow to run [eggnog mapper on a large dataset](https://github.com/eggnogdb/eggnog-mapper/wiki/eggNOG-mapper-v2#setting-up-large-annotation-jobs)
+
+In brief it contains 4 steps:
+
+* Splitting the input FASTA files into chunks
+* Run diamond from eggnogmapper on each chunks
+* Merge all results to one unique `emapper.seed_orthologs`
+* Perform annotations from this unique file