Added initial rml and publications sections

Author: Aklakan

docs/publications/index.md

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+---
+title: Publications
+has_children: false
+nav_order: 200
+layout: default
+---
+
+
+
+The following aspects of RPT have been published:
+
+
+* **Scaling RML and SPARQL-based Knowledge Graph Construction with Apache Spark.**
+
+  *Stadler, Claus and B{\"u}hmann, Lorenz and Meyer, Lars-Peter and Martin, Michael*
+
+  KGCW2023, the 4th International Workshop on Knowledge Graph Construction @ ESWC2023
+
+```bibtex
+@inproceedings{kgcw2023sbmm,
+  title={Scaling RML and SPARQL-based Knowledge Graph Construction with Apache Spark},
+  author={Stadler, Claus and B{\"u}hmann, Lorenz and Meyer, Lars-Peter and Martin, Michael},
+  booktitle={KGCW2023, the 4th International Workshop on Knowledge Graph Construction},
+  year={2023}
+}
+```
+

docs/rml/index.md

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+---
+title: Publications
+has_children: false
+nav_order: 150
+layout: default
+---
+
+# Knowledge Graph Construction with (R2)RML
+
+RPT can translate RML and R2RML to SPARQL that can be run either with the [`integrate`](integrate) (single-threaded) or the [`sansa query`](sansa) (multi-threaded) commands.
+
+## Basic Usage
+
+### Conversion of RML files to SPARQL
+
+```bash
+# Convert an RML file to a sequence of SPARQL queries:
+rpt rmltk rml to sparql mapping.rml.ttl > mapping.raw.rml.rq
+
+# Group and/or reorder SPARQL queries:
+rpt rmltk optimize workload mapping.raw.rml.rq --no-order > mapping.rml.rq
+```
+
+### Executing the mapping process
+
+* ... using the single threaded Jena engine:
+
+    ```bash
+    rpt integrate mapping.rq
+    ```
+
+* Using RPT's parallel Spark-based executor:
+
+    ```bash
+    rpt sansa query mapping.rq
+    ```
+
+
+## Core Technology
+
+The core technology, i.e. the API and SPARQL converters, are part of our [(R2)RML-Toolkit](https://github.com/Scaseco/R2-RML-Toolkit).
+
+
+