add initial yang code (nothing useful)

Author: thomas-mangin

pyproject.toml

@@ -43,7 +43,8 @@ classifiers = [
 [tool.poetry.dependencies]
 python = "~3.6 || ~3.7 || ^3.8"  # Compatible python versions must be declared here
 pyang = "^2.3.2"
-pyang-jsontree-plugin = "^0.1"
+pyangbind="^0.8.1"
+pygments-yang-lexer = "^0.2"
 
 # Optional dependencies (development)
 pudb = "^2019.2"