README.mdの追加

README.md

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+# CocoaTweet
+This is a library for using Twitter API from C++  
+
+# Dependency
+- libcurl
+- libssl
+
+# Features
+- statuses/update
+
+Now, only post a tweet.  
+
+# How
+## API Key Registration
+### 1.Write Key into code
+write api key into code and create Key object use it.  
+```
+#include "cocoatweet/oauth/key.h"
+
+auto consumerKey       = "your consumer key";
+auto consumerSecret    = "your consumer secret";
+auto accessToken       = "your access token";
+auto accessTokenSecret = "your access token secret";
+
+CocoaTweet::OAuth::Key key(consumerKey, consumerSecret, accessToken, accessTokenSecret);
+
+```
+
+
+### 2. Load Key from JSON file
+prepare file which written 'api-key' with json format.  
+```
+{
+  "consumer_key" : "your consumer key",
+  "consumer_secret" : "your consumer secret",
+  "access_token" : "your access token",
+  "access_token_secret" : "your access token secret"
+}
+```
+
+then you can load api key from json file.  
+```
+#include "cocoatweet/oauth/key.h"
+
+CocoaTweet::OAuth::Key key = CocoaTweet::OAuth::Key::fromJsonFile("api_key.json");
+```
+
+## Generate API object
+generating API object with Key.  
+this object is API entry point.  
+
+```
+#include "cocoatweet/api/api.h"
+
+CocoaTweet::API::API api(key);
+
+```
+
+## Post Tweet
+post tweet  
+```
+api.status().Update("Hello, World!!\nTweet from Cocoa Twitter Library");
+```