added readme and change py version in travis

.travis.yml

@@ -1,4 +1,4 @@
 language: python
 python:
-        - "3.7.1"
+        - "3.7"
 script: make test

README.md

@@ -0,0 +1,11 @@
+<h1 align='center'>DeadSimpleKV</h1>
+
+[![Build Status](https://travis-ci.org/beardog108/DeadSimpleKV.svg?branch=master)](https://travis-ci.org/beardog108/DeadSimpleKV)
+
+As the name implies, this is merely a simple key-value store for Python.
+
+Not counting comments and tests, it is less than 100 lines of code.
+
+It doesn't do anything crazy. It just takes json serializable data and writes it to disk.
+
+You can control where and when to read/write, and that's it.