docs(readme): Start adding documentation for React version

docs/latest/_book/history/v1/gitbook/gitbook-plugin-edit-link/plugin.js

@@ -0,0 +1,30 @@
+require(["gitbook", "jQuery"], function(gitbook, $) {
+    gitbook.events.bind('start', function (e, config) {
+        var conf = config['edit-link'];
+        var label = conf.label;
+        var base = conf.base;
+        var lang = gitbook.state.innerLanguage;
+        if (lang) {
+            // label can be a unique string for multi-languages site
+            if (typeof label === 'object') label = label[lang];
+
+            lang = lang + '/';
+        }
+
+        // Add slash at the end if not present
+        if (base.slice(-1) != "/") {
+            base = base + "/";
+        }
+
+        gitbook.toolbar.createButton({
+            icon: 'fa fa-edit',
+            text: label,
+            onClick: function() {
+                var filepath = gitbook.state.filepath;
+
+                window.open(base + lang + filepath);
+            }
+        });
+    });
+
+});