docs for argo yml generation

docs/argo_fomatting_rules.md

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+This document aims at centralizing all the informations about the yaml file that will be submitted to argo
+
+- names can only contain alphanumeric characters or '-' 
+
+
+

docs/todo.md

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+[ ] handle the way arguments are parsed : 
+    - currently arguments are stored in the computing object as a list of string
+        - argo_builder.getComputingCommands() takes the command as a parameter to treat `sh -c`'s argument differently, but this is not generic enough
+    - refactor on oc-catalog : we could store it as a string and parse it differently depending on the command
+