Adding logo to readme (#135)

* Adding logo and badges to readme

README.md

@@ -1,11 +1,21 @@
-# Speedb
+<div align="center">
+  <img src="speedb-logo.gif" width="480px" />
 
-![GitHub contributors](https://img.shields.io/github/contributors/speedb-io/speedb)
+</div>
+<div align="center">
 
+![GitHub](https://img.shields.io/github/license/speedb-io/speedb)
+![GitHub contributors](https://img.shields.io/github/contributors/speedb-io/speedb?color=blue)
+![GitHub pull requests](https://img.shields.io/github/issues-pr/speedb-io/speedb)
+![GitHub closed pull requests](https://img.shields.io/github/issues-pr-closed/speedb-io/speedb?color=green)
+</div>
 
+# Speedb
 Speedb is a library that provides persistent key-value stores. Keys and values are arbitrary byte arrays. The keys are ordered within the key value store according to a user-specified comparator function.
 It is maintained by Speedb and is forked from Rocksdb, developed by Facebook.
-
+<div>
+  <img src="bee.gif" width="80px" />
+</div>
 
 ## Usage
 * If speedb is in your default library path:
@@ -77,3 +87,5 @@ See the [contributing guide](CONTRIBUTING.md).
 
 ## License
 Speedb is open-source and licensed under the [Apache 2.0 License](LICENSE.Apache).
+
+<img src="speedb-b.gif" width="200px" />