Readme file update

README.md

@@ -22,6 +22,8 @@ For more information, see [action.yml](./action.yml) and [GitHub Actions guide](
 | `gcov-executable` | Executable name with optional arguments | Use a particular [gcov](https://gcc.gnu.org/onlinedocs/gcc/Gcov.html) executable. Must match the compiler you are using, e.g. `llvm-cov gcov` for [LLVM Clang](https://clang.llvm.org/). See [this](https://gcovr.com/en/stable/guide/compiling.html#choosing-the-right-gcov-executable). |
 | `excludes` | One or more regular expression | Exclude source files that match these filters. |
 | `fail-under-line` | 0 - 100 | Fail if the total line coverage is less than this value. |
+| `html-out` | Path | Output file of the generated HTML coverage report. |
+| `html-theme` | `green` , `blue` , `github.blue` , `github.green` , `github.dark-green` , `github.dark-blue` | Override the default color theme for the HTML report. |
 | `xml-out` | Path | Output file of the generated XML coverage report. |
 | `coveralls-out` | Path | Output file of the generated [Coveralls API](https://docs.coveralls.io/api-introduction) coverage report. |
 | `coveralls-send` | `true` or `false` | Send the generated Coveralls API coverage report to it's endpoint. Defaults to `false`. |
@@ -63,6 +65,25 @@ jobs:
       src/internal/*
 ```
 
+#### Output HTML Report
+
+```yaml
+- name: Generate a html code coverage report
+  uses: threeal/gcovr-action@xml-out
+  with:
+    html-out: coverage.html
+```
+
+#### Output HTML Report generated with a specific theme
+
+```yaml
+- name: Generate a html code coverage report
+  uses: threeal/gcovr-action@xml-out
+  with:
+    html-out: coverage.html
+    html-theme: github.green
+```
+
 #### Output XML Report
 
 ```yaml