docs: companion files

Author: alpcoker

docs/processing-companion-files.md

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+
+# Processing Companion Files
+
+We are also processing the companion files with the same name of your main photo files. The default settings is currently only `mov` which is popular among [iPhone Live Photos](https://support.apple.com/en-us/104966) output is also exporting with a video file next to your photo.
+
+You can extend this companion extension by using [settings verb's set action](/docs/settings#setting-a-single-value).
+
+## Setting Companion Extensions Example
+```
+settings -k CompanionExtensions -v mov,ext1,ext2,ext3
+```

docs/supported-photo-types.md

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+# Supported Photo Types
+
+With the default settings, we can process `jpg`, `jpeg`, `heic` and `png` photo files. As this tool internally using [MetadataExtractor](https://www.nuget.org/packages/MetadataExtractor/) package to extract image EXIF data, you can extend the supported photos with the [MetadataExtractor supported files](https://github.com/drewnoakes/metadata-extractor-dotnet?tab=readme-ov-file#features) by using [settings verb's set action](/docs/settings#setting-a-single-value).
+
+## Setting Supported Extensions Example
+```
+settings -k SupportedExtensions -v jpg,ext1,ext2,ext3
+```