added SeeedNrf52480Battery and GaussianFilter1D

[Maaajaaa]

please check for compliance
thank you

[github-actions]

Arduino Lint has suggestions for possible improvements to https://github.com/Maaajaaa/SeeedNrf52480Battery:

Linting library in SeeedNrf52480Battery
WARNING: library.properties name value SeeedNrf52480Battery is longer than the recommended length of 16 characters.
         See: https://arduino.github.io/arduino-cli/latest/library-specification/#libraryproperties-file-format    
         (Rule LP010)                                                                                              

Linter results for project: 0 ERRORS, 1 WARNINGS

-------------------

Linting sketch in SeeedNrf52480Battery/examples/SeeedNrf52480Battery

Linter results for project: no errors or warnings

-------------------

Linter results for projects: 0 ERRORS, 1 WARNINGS

[github-actions]

Your submission has now been accepted! Thanks for your contribution to the Arduino Library Manager index.

The library(s) will be available for installation via Library Manager within a day's time.

You can check the logs from the Library Manager indexer for your library(s) here:
http://downloads.arduino.cc/libraries/logs/github.com/Maaajaaa/GaussianFilter1D/
http://downloads.arduino.cc/libraries/logs/github.com/Maaajaaa/SeeedNrf52480Battery/