If your project has source files with unrecognized extensions, you can force Codacy to include them in the next project analysis. To do so, go to your project's Settings>File Extensions
Project Settings -> File Extensions
To change it, add the extensions you want to be recognized for each language.
After clicking Save, you will be given the opportunity to retry the most recent commit with the new settings. To do this, click on the option Analyze now that appears in the footer of the screen: