Update README

README.md

@@ -1 +1,73 @@
 # TweetupKit
+
+_TweetupKit_ is a Swift library which helps to make a presentation on Twitter. It parses decodes scripts of presentations written in a format similar to Markdown. Decoded tweets are automatically posted with a constant interval.
+
+```swift
+let speaker = Speaker(
+    twitterCredential: twitterCredential,
+    githubToken: githubToken,
+    outputDirectoryPath: imageDirectoryPath
+)
+
+let tweetsString = """
+    Twinkle, twinkle, little star,
+    How I wonder what you are!
+
+    ---
+
+    Up above the world so high,
+    Like a diamond in the sky.
+
+    ```swift:hello.swift
+    let name = "Swift"
+    print("Hello \\(name)!")
+    ```
+
+    ---
+
+    Twinkle, twinkle, little star,
+    How I wonder what you are!
+
+    ![](\(imagePath))
+    """
+
+let tweets = try! Tweet.tweets(from: tweetsString)
+speaker.post(tweets: tweets, interval: 10.0).get { getResponses in
+    let responses = try getResponses()
+    for response in responses {
+        print("\(response.statusId), \(response.screenName)")
+    }
+}
+```
+
+## Tweets format
+
+    Tweets can be written in a format similar to Markdown like this.
+    Each tweet is separated by ---.
+
+    ---
+
+    Tweets can contain code. TweetupKit creates a Gist of the code,
+    and a link to the Gist and a screenshot of the code are posted together.
+
+    ```swift:hello.swift
+    let name = "Swift"
+    print("Hello \(name)!")
+    ```
+
+    ---
+
+    Also images can be attached to tweets.
+
+    ![](path/to/image)
+
+## Installation
+
+Swift Package Manager is available.
+
+```swift
+.package(
+    url: "https://github.com/swift-tweets/tweetup-kit.git",
+    from: "0.2.0"
+)
+```