Add License, fix typo & go report card

[CI SKIP]

Author: marz619

LICENSE

@@ -0,0 +1,13 @@
+Copyright 2015-2016 CrowdRiff
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

README.md

@@ -1,7 +1,7 @@
 Wredis
 ===
 
-[![Build Status](https://travis-ci.org/crowdriff/wredis.svg?branch=master)](https://travis-ci.org/crowdriff/wredis)
+[![Build Status](https://travis-ci.org/crowdriff/wredis.svg?branch=master)](https://travis-ci.org/crowdriff/wredis) [![Go Report Card](https://goreportcard.com/badge/github.com/crowdriff/wredis)](https://goreportcard.com/report/github.com/crowdriff/wredis)
 
 Wredis is a wrapper around the [redigo](https://github.com/garyburd/redigo) `redis.Pool` and provides an easy-to-use API for [Redis commands](http://redis.io/commands)
 

wredis_keys.go

@@ -25,7 +25,7 @@ func (w *Wredis) Del(keys ...string) (int64, error) {
 	return w.ExecInt64(del)
 }
 
-// Exists checks for the existance of `key` in Redis. Note however,
+// Exists checks for the existence of `key` in Redis. Note however,
 // even though a variable number of keys can be passed to the EXISTS command
 // since Redis 3.0.3, we will restrict this to a single key in order to
 // be able to return an absolute response regarding existence.