Added how to write a parser.

docs/index.rst

@@ -12,4 +12,5 @@ and infrastructure with a simplyfied architecture and consolidated code base.
    dev_guidelines
    api
    ops
+   parser_tutorial
    reference

rawapi.requirements.txt

+requests
+celery[redis]
+elasticsearch-dsl>=6.0.0,<7.0.0
+mongoengine
+flask
+flask-restplus
+flask-cors
+flask_httpauth
+itsdangerous
+passlib
+python-logstash
+gitpython
+gunicorn
+structlog
+recommonmark
+m2r
+requests
+click
+sphinx
+sphinxcontrib.httpdomain
+sphinx_rtd_theme
+zipstream
+bagit
+psycopg2-binary
+sqlalchemy
+bcrypt
+matid
+ase==3.15.0
+filelock
+ujson