Updated README. WDN issue task #1775.

Updated README. Please let me know if there is anything I missed or if I should further explain or rewrite some of the steps. Thanks.

README.md

@@ -17,4 +17,16 @@ The UNLedu Framework is expected to regularly request the JavaScript file `www/j
 
 Automated Testing
 -----
-Run automated tests via this command `pyrus run-phpt tests`
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+Run automated tests via this command `pyrus run-phpt tests`
+
+Local Installation 
+------
+1) Clone and configure configure virtual host for [WDN Repo](https://github.com/unl/wdntemplates) 
+2) Clone [UNL Alert](https://git.unl.edu/dxg/UNL_Alert) and configure virtual host to point to `UNL_Alert/www`
+3) Update `www/json/unlcap.js` to use a test alert data. For example:
+    unlAlerts.data = {"alert":{"identifier":"cd32fb091ecd347f4d49f7b53b073b9d","sender":"police.unl.edu","sent":"2024-06-10T19:17:39+00:00","status":"Test","msgType":"Alert","scope":"Public","note":"This is only a test2","info":[{"category":"Safety","event":"UNL Alert","ugency":"Immediate","severity":"Extreme","certainty":"Observed","headline":"Mark Only Test","description":"UNL Alert:  this is a test3","web":"http:\/\/www.unl.edu\/"}]}};
+4) Update alertDataURL in `wdn/templates_5.3/js-src/unlalert.babel.js` to point to your localhost alert's unlcap.js file (e.g https://localhost.unl.edu/json/unlcap.js)
+5) Use test SHTML files like `debug-clean.shtml` in the WDN project you have cloned to verify that the alert banner is working
+6) If the banner is not displaying, try disabling your browser's cache.
+
+last updated July 17, 2024
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