added README

README.md

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+[![Build Status](https://drone.srv.kapelle.org/api/badges/niklas/startpage/status.svg?ref=refs/heads/master)](https://drone.srv.kapelle.org/niklas/startpage)
+
+# How to set the new Tab
+## Firefox
+
+[Reddit thread](https://www.reddit.com/r/startpages/comments/g3qndt/psa_how_to_set_a_custom_new_tab_page_in_firefox/)
+
+Create 2 files inside of the firefox install directory. 
+
+`${installDir}/defaults/pref/autoconfig.js`
+```js
+pref("general.config.filename", "autoconfig.cfg");
+pref("general.config.obscure_value", 0);
+pref("general.config.sandbox_enabled", false);
+```
+
+`${installDir}/autoconfig.cfg`
+```
+// first line is a comment
+var {classes:Cc,interfaces:Ci,utils:Cu} = Components;
+var newTabURL = "http://localhost:8080";
+aboutNewTabService = Cc["@mozilla.org/browser/aboutnewtab-service;1"].getService(Ci.nsIAboutNewTabService);
+aboutNewTabService.newTabURL = newTabURL;
+```
+
+Replace the "localhost" line in `autoconfig.cfg` with your URL. 
+Also you can set the homepage via your normal settings.
+
+Alternatively you can use a extentions called [New Tab override](https://addons.mozilla.org/en-US/firefox/addon/new-tab-override/).
+
+## Chrome
+
+Maybe [this](https://chrome.google.com/webstore/detail/custom-new-tab-url/mmjbdbjnoablegbkcklggeknkfcjkjia) extention. Not tested yet.