Updated README and index.rst

Author: kanhereashwin

README.md

@@ -82,6 +82,7 @@ In the directory organization above:
       * [2022 Google Android Derived Dataset](https://www.kaggle.com/competitions/smartphone-decimeter-2022)
       * [Precise Ephemeris Data](https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/gnss_mgex.html)
       * [TU Chemnitz smartLoc Dataset](https://www.tu-chemnitz.de/projekt/smartLoc/gnss_dataset.html.en#Datasets)
+      * [NMEA](https://www.sparkfun.com/datasheets/GPS/NMEA%20Reference%20Manual-Rev2.1-Dec07.pdf)
 
   * The `utils` directory contains utilities used to handle
     GNSS measurements, time conversions, visualizations, satellite

docs/source/index.rst

@@ -91,6 +91,7 @@ In the directory organization above:
       * `2022 Google Android Derived Dataset <https://www.kaggle.com/competitions/smartphone-decimeter-2022>`__
       * `Precise Ephemeris Data <https://cddis.nasa.gov/Data_and_Derived_Products/GNSS/gnss_mgex.html>`__
       * `TU Chemnitz smartLoc Dataset <https://www.tu-chemnitz.de/projekt/smartLoc/gnss_dataset.html.en#Datasets>`__
+      * `NMEA <https://www.sparkfun.com/datasheets/GPS/NMEA%20Reference%20Manual-Rev2.1-Dec07.pdf>`__
 
   * The :code:`utils` directory contains utilities used to handle
     GNSS measurements, time conversions, visualizations, satellite