Added Xcode project that builds libwebp as a framework for all 4 platforms + small macos command line example

+ gitignore, readme, travis CI script

Author: bpoplauschi

.gitignore

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+# Xcode
+#
+# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+
+## Build generated
+build/
+DerivedData/
+
+## Various settings
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata/
+
+## Other
+*.moved-aside
+*.xccheckout
+*.xcscmblueprint
+
+## Obj-C/Swift specific
+*.hmap
+*.ipa
+*.dSYM.zip
+*.dSYM
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
+#
+# Pods/
+#
+# Add this line if you want to avoid checking in source code from the Xcode workspace
+# *.xcworkspace
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/#source-control
+
+fastlane/report.xml
+fastlane/Preview.html
+fastlane/screenshots/**/*.png
+fastlane/test_output
+
+# Code Injection
+#
+# After new code Injection tools there's a generated folder /iOSInjectionProject
+# https://github.com/johnno1962/injectionforxcode
+
+iOSInjectionProject/

.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 'libwebp' -sdk macosx -configuration Debug | xcpretty -c
+    - xcodebuild clean build -scheme 'libwebp' -sdk iphonesimulator PLATFORM_NAME=iphonesimulator -configuration Debug | xcpretty -c
+    - xcodebuild clean build -scheme 'libwebp' -sdk appletvsimulator -configuration Debug | xcpretty -c
+    - xcodebuild clean build -scheme 'libwebp' -sdk watchsimulator -configuration Debug | xcpretty -c
+
+    - echo Build the example app
+    - xcodebuild build -scheme 'libwebpExample' -sdk macosx -configuration Debug | xcpretty -c

README.md

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+# libwebp + Xcode
+
+A wrapper for [libwebp](https://github.com/webmproject/libwebp) + Xcode project.
+This enables Carthage support
+
+[![CI Status](http://img.shields.io/travis/SDWebImage/libwebp-Xcode.svg?style=flat)](https://travis-ci.org/SDWebImage/libwebp-Xcode)
+[![Carthage compatible](https://img.shields.io/badge/Carthage-compatible-4BC51D.svg?style=flat)](https://github.com/SDWebImage/libwebp-Xcode)
+
+## Requirements
+
++ iOS 8
++ macOS 10.6
++ tvOS 9.0
++ watchOS 2.0
+
+## Installation
+
+libwebp is (via this repo) available through [Carthage](https://github.com/Carthage/Carthage).
+
+```
+github "SDWebImage/libwebp-Xcode"
+```
+
+## Usage
+
+Use libwebp as you would normally, this is just a repo that adds an Xcode proj.
+
+## License
+
+libwebp is available under the BSD-3 license. See [the LICENSE file](https://github.com/webmproject/libwebp/blob/master/COPYING) for more info.

Xcode/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>0.6.1</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

Xcode/libwebp.h

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+//
+//  libwebp.h
+//  libwebp
+//
+//  Created by Bogdan Poplauschi on 28/08/2018.
+//  Copyright © 2018 SDWebImage. All rights reserved.
+//
+
+#import <Foundation/Foundation.h>
+
+//! Project version number for libwebp.
+FOUNDATION_EXPORT double libwebpVersionNumber;
+
+//! Project version string for libwebp.
+FOUNDATION_EXPORT const unsigned char libwebpVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <libwebp/PublicHeader.h>
+
+#import <libwebp/decode.h>
+#import <libwebp/demux.h>
+#import <libwebp/encode.h>
+#import <libwebp/format_constants.h>
+#import <libwebp/mux.h>
+#import <libwebp/mux_types.h>
+#import <libwebp/types.h>