feat: add basic grammer definition file

Author: swsoyee

README.md

@@ -0,0 +1,55 @@
+# highlighths-spl - a grammar file for Splunk search processing language
+
+## Usage
+
+Simply include the `highlight.js` library in your webpage or Node app, then load this module.
+
+### Static website or simple usage
+
+Simply load the module after loading `highlight.js`.  You'll use the minified version found in the `dist` directory.  This module is just a CDN build of the language, so it will register itself as the Javascript is loaded.
+
+```html
+<script type="text/javascript" src="/path/to/highlight.min.js"></script>
+<script type="text/javascript" src="/path/to/spl.min.js"></script>
+<script type="text/javascript">
+  hljs.highlightAll();
+</script>
+```
+
+### [WIP] Using directly from the UNPKG CDN
+
+```html
+<!-- <script type="text/javascript"
+  src="https://unpkg.com/highlightjs-spl@0.1.0/dist/spl.min.js"></script> -->
+```
+
+- More info: <https://unpkg.com>
+
+### With Node or another build system
+
+If you're using Node / Webpack / Rollup / Browserify, etc, simply require the language module, then register it with Highlight.js.
+
+```javascript
+var hljs = require('highlight.js');
+var hljsRobotsTxt = require('highlightjs-spl');
+
+hljs.registerLanguage("spl", hljsRobotsTxt);
+hljs.initHighlightingOnLoad();
+```
+
+
+## License
+
+`highlight.js` is released under the MIT License. See [LICENSE][1] file for details.
+
+### Author
+
+Wei Su <swsoyee@gmail.com>
+
+## Links
+
+- The official site for the `highlight.js` library is <https://highlightjs.org/>.
+- The `highlight.js` GitHub project: <https://github.com/highlightjs/highlight.js>
+- Learn more about Splunk search processing language: <https://docs.splunk.com/Splexicon:SPL>
+
+[1]: https://github.com/highlightjs/highlightjs-robots-txt/blob/master/LICENSE