doc: move the md2pdf files into the specific directory

- move the md2pdf files into the specific directory doc/md2pdf
- add a README.md to explain the command to generate the pdf

Author: PascaleBorscia

doc/md2pdf/README.md

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+How to generate a PDF document from a set of Markdown files with Docker ?
+
+Follows the guide: [Fiware markdown to PDF](https://github.com/FiwareULPGC/fiware-markdown-to-pdf#quick-start-guide-with-docker)
+
+## User Guide
+
+    git clone https://github.com/Orange-OpenSource/fiware-cepheus.git
+    cd fiware-cepheus
+    docker run -v=/Users/{UserName}/fiware-cepheus:/md2pdf fiwareulpgc/markdown-to-pdf -i /md2pdf/doc/md2pdf/md2pdf.yml -o /md2pdf/user-guide.pdf
+
+## Admin Guide
+
+    git clone https://github.com/Orange-OpenSource/fiware-cepheus.git
+    cd fiware-cepheus
+    docker run -v=/Users/{UserName}/fiware-cepheus:/md2pdf fiwareulpgc/markdown-to-pdf -i /md2pdf/doc/md2pdf/md2pdf_admin.yml -o /md2pdf/admin-guide.pdf
+

doc/md2pdf/md2pdf.yml

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+files_order:
+- '../index.md'
+- '../cep/index.md'
+- '../cep/configuration.md'
+- '../cep/mapping.md'
+- '../cep/types.md'
+- '../cep/geospatial.md'
+- '../broker/index.md'
+- '../examples/1_RoomsAndFloors/index.md'
+- '../examples/2_CloseShutters/index.md'
+- '../examples/3_CepAndBroker/index.md'
+- '../examples/4_CepAndBrokerAndOrion/index.md'
+- '../examples/5_TemperatureThreshold/index.md'
+- '../examples/6_QueryAndCommand/index.md'
+- '../examples/7_Metadata/index.md'
+- '../examples/8_DateAndGeoPoint/index.md'
+- '../examples/9_Geofencing/index.md'

doc/md2pdf/md2pdf_admin.yml

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+files_order:
+- '../admin/cep.md'
+- '../admin/broker.md'