Add not-working-yet text box, plus a bit more css

css/molecules/MessageComposer.css

@@ -0,0 +1,12 @@
+.mx_MessageComposer {
+    position: absolute;
+    bottom: 5px;
+    right: 0px;
+    left: 0px;
+    width: 100%;
+    height: 36px;
+}
+
+.mx_MessageComposer textarea {
+    width: 100%;
+}

css/molecules/MessageTile.css

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+.mx_MessageTile {
+    border-bottom: 1px solid #eee;
+}

src/molecules/MessageComposer.js

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+var React = require('react');
+
+var MatrixClientPeg = require("../MatrixClientPeg");
+
+module.exports = React.createClass({
+    render: function() {
+        return (
+            <div className="mx_MessageComposer">
+                <form>
+                    <textarea />
+                </form>
+            </div>
+        );
+    },
+});
+