Implemented a first and basic version of a Rete rule engine

docs/source/blog/blog.rst

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 Hi, I have the feeling that I am almost there with the parsers part. I have
 
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+2021-01-30
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+Blog
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+It's been a very long time since I wrote in the blog. I guess I was too busy to spend some time on it.
+2020 was the year of the COVID 19. I guess that being contained with my son and my wife gave me other priorities.
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+Nevertheless, I kept on working on Sheerka.
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+One major achivement that I made was a demonstration of Sheerka to other people. I happened in mid September.
+I demonstrated how to declare numbers using the ExactParser and the BnfNodeParser. Even thought I did not explicitly
+mentionned theses names, my demo was far to technique. The impression I gave was that Sheerka was too complicated (in 
+the sens of too technical too use). Unfortunately, that was the case.
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+Did the demo come too soon ? I guess so, in a certain way, but It really helped me to have a first feedback, even if it did
+not reward the months of hard works.
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+Where am I today ? It's impressive the admit that since that demon (in September) I did not implemented any major capability.
+Sheerka does not know much bettet that at this time
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+I did though work on :
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+    * performances
+    * debugger
+    * simple version of the rule engine (that goes with the debuggger)
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+Actually almost FOUR months of work for technical benefit. There were some parts of the code that were rewritten.
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+I am a little bit sad, time flies so fast.