Add readme and travis-CI script

Author: dreampiggy

.travis.yml

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+
+language: objective-c
+osx_image: xcode9.4
+
+env:
+  global:
+    - LC_CTYPE=en_US.UTF-8
+    - LANG=en_US.UTF-8
+
+notifications:
+  email: false
+
+before_install:
+    - env
+    - locale
+    - gem install xcpretty --no-rdoc --no-ri --no-document --quiet
+    - xcpretty --version
+    - xcodebuild -version
+    - xcodebuild -showsdks
+
+script:
+    - set -o pipefail
+
+    - echo Build the framework
+    - xcodebuild clean build -scheme 'libflif' -sdk macosx -configuration Debug | xcpretty -c
+    - xcodebuild clean build -scheme 'libflif' -sdk iphonesimulator PLATFORM_NAME=iphonesimulator -configuration Debug | xcpretty -c
+    - xcodebuild clean build -scheme 'libflif' -sdk appletvsimulator -configuration Debug | xcpretty -c
+    - xcodebuild clean build -scheme 'libflif' -sdk watchsimulator -configuration Debug | xcpretty -c
+
+    - echo Build the example app
+    - xcodebuild build -scheme 'libflifExample' -sdk macosx -configuration Debug | xcpretty -c

README.md

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+# libflif + Xcode
+
+[![CI Status](http://img.shields.io/travis/SDWebImage/libflif-Xcode.svg?style=flat)](https://travis-ci.org/SDWebImage/libflif-Xcode)
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/SDWebImage/libflif-Xcode)
+
+A wrapper for [libflif](https://github.com/FLIF-hub/FLIF) + Xcode project.
+
+libflif is a codec library for [Free Lossless Image Format](https://flif.info/).
+
+This enables Carthage support.
+
+## Requirements
+
++ iOS 8
++ macOS 10.7
++ tvOS 9.0
++ watchOS 2.0
+
+## Installation
+
+libflif is (via this repo) available through [Carthage](https://github.com/Carthage/Carthage).
+
+```
+github "SDWebImage/libflif-Xcode"
+```
+
+## Usage
+
+Use libflif as you would normally, this is just a repo that adds an Xcode proj.
+
+## License
+
+libflif is available under the LGPL license (this library use the enc + dec part). See [the LICENSE file](https://github.com/FLIF-hub/FLIF/blob/master/LICENSE_LGPL) for more info.
+
+