Add README with examples

README.md

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+#  Matrix Client SDK for GLib
+
+This is a Matrix client-server SDK for GLib >= 2.40. As of now it
+mostly mimics the official Python SDK.
+
+# Usage
+
+The SDK provides 2 layers of interaction. The low-level layer just wraps the
+raw HTTP API calls. The high-level layer wraps the low-level layer and provides
+an object model to perform actions on.
+
+## Client
+
+``` c
+
+#include <matrix-glib/matrix-client.h>
+
+gchar *token = NULL;
+MatrixClient *client = matrix_client_new("http://localhost:8008", NULL);
+matrix_client_register_with_password(client, "foobar", "monkey”);
+g_object_get(client, "token", &token, NULL);
+room = matrix_client_create_room(client, "my_room_alias");
+matrix_room_send_text(room, "Hello!");
+```
+
+## API
+
+```c
+#include <matrix-glib/matrix-api.h>
+
+static void
+sync_finished(MatrixAPI *api,
+              MatrixAPIResponse *response,
+              gpointer data)
+{
+    /* Do something with the response */
+}
+
+static void
+message_sent(MatrixAPI *api,
+             MatrixAPIResponse *response,
+             gpointer data)
+{
+    /* Do something with the response */
+}
+
+matrix = matrix_api_new("https://matrix.org", "some_token");
+g_signal_connect(G_OBJECT(api),
+                 "request-finished",
+                 G_CALLBACK(sync_finished),
+                 NULL);
+matrix_api_initial_sync(matrix, sync_finished);
+matrix_api_send_message(matrix, "!roomid:matrix.org", "Hello!", message_sent);
+```
+
+# Structure
+
+The SDK is split into two modules: `MatrixAPI` and `MatrixClient`.
+
+## API
+
+This contains the raw HTTP API calls and has minimal business logic. You can
+set the access token (`token`) to use for requests as well as set a custom
+transaction ID (`txn_id`) which will be incremented for each request.
+
+## Client
+
+This encapsulates the API module and provides object models such as `Room`.