Add syntax highlighting for readability (#64)

README.md

@@ -5,7 +5,7 @@ Any warnings or errors will be annotated in the Pull Request.
 
 ## Usage
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 ```
 
@@ -15,7 +15,7 @@ If set, check file names for spelling mistakes as well.
 
 This parameter is optional; by default `codespell` will only check the file contents.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   check_filenames: true
@@ -27,7 +27,7 @@ If set, check hidden files (those starting with ".") for spelling mistakes as we
 
 This parameter is optional; by default `codespell` will not check hidden files.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   check_hidden: true
@@ -39,7 +39,7 @@ File with lines that should not be checked for spelling mistakes.
 
 This parameter is optional; by default `codespell` will check all lines.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   exclude_file: src/foo
@@ -51,7 +51,7 @@ Comma-separated list of files to skip (it accepts globs as well).
 
 This parameter is optional; by default `codespell` won't skip any files.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   skip: foo,bar
@@ -63,7 +63,7 @@ Comma-separated list of builtin dictionaries to use.
 
 This parameter is optional; by default `codespell` will use its default selection of built in dictionaries.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   builtin: clear,rare
@@ -76,7 +76,7 @@ Words are case sensitive based on how they are written in the dictionary file.
 
 This parameter is optional; by default `codespell` will check all words for typos.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   ignore_words_file: .codespellignore
@@ -89,7 +89,7 @@ Words are case sensitive based on how they are written in the dictionary file.
 
 This parameter is optional; by default `codespell` will check all words for typos.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   ignore_words_list: abandonned,ackward
@@ -103,7 +103,7 @@ If set to "*", all misspelling in URIs and emails will be ignored.
 
 This parameter is optional; by default `codespell` will check all URIs and emails for typos.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   uri_ignore_words_list: abandonned
@@ -116,7 +116,7 @@ This can be useful if your project has code you don't want to spell check for so
 
 This parameter is optional; by default `codespell` will run on your whole repository.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   path: src
@@ -130,7 +130,7 @@ All errors and warnings are annotated in Pull Requests, but it will act like eve
 
 This parameter is optional; setting this to any value will enable it.
 
-```
+```yml
 uses: codespell-project/actions-codespell@v1
 with:
   only_warn: 1