Document some more parameters

README.md

@@ -9,6 +9,54 @@ Any warnings or errors will be annotated in the Pull Request.
 uses: codespell-project/actions-codespell@master
 ```
 
+### Parameter: check_filenames
+
+If set, check file names for spelling mistakes as well.
+
+This parameter is optional; by default `codespell` will only check the file contents.
+
+```
+uses: codespell-project/actions-codespell@master
+with:
+  check_filenames: true
+```
+
+### Parameter: check_hidden
+
+If set, check hidden files (those starting with ".") for spelling mistakes as well.
+
+This parameter is optional; by default `codespell` will not check hidden files.
+
+```
+uses: codespell-project/actions-codespell@master
+with:
+  check_hidden: true
+```
+
+### Parameter: exclude_file
+
+File with lines that should not be checked for spelling mistakes.
+
+This parameter is optional; by default `codespell` will check all lines.
+
+```
+uses: codespell-project/actions-codespell@master
+with:
+  exclude_file: src/foo
+```
+
+### Parameter: skip
+
+Comma-separated list of files to skip (it accepts globs as well).
+
+This parameter is optional; by default `codespell` won't skip any files.
+
+```
+uses: codespell-project/actions-codespell@master
+with:
+  skip: foo,bar
+```
+
 ### Parameter: path
 
 Indicates the path to run `codespell` in.