Setup the project and the CI configuration.

.circleci/config.yml

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+version: 2
+
+jobs:
+  "php-5.6":
+    docker:
+      - image: circleci/php:5.6
+    working_directory: ~/dd-trace
+    steps:
+      - checkout
+      - run: composer install -n --prefer-dist
+      - run: composer lint
+      - run: composer test
+
+  "php-7.0":
+    docker:
+      - image: circleci/php:7.0
+    working_directory: ~/dd-trace
+    steps:
+      - checkout
+      - run: composer install -n --prefer-dist
+      - run: composer lint
+      - run: composer test
+
+  "php-7.1":
+    docker:
+      - image: circleci/php:7.1
+    working_directory: ~/dd-trace
+    steps:
+      - checkout
+      - run: composer install -n --prefer-dist
+      - run: composer lint
+      - run: composer test
+
+  "php-7.2":
+    docker:
+      - image: circleci/php:7.2
+    working_directory: ~/dd-trace
+    steps:
+      - checkout
+      - run: composer install -n --prefer-dist
+      - run: composer lint
+      - run: composer test

.gitignore

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+/vendor/
+composer.lock

README.md

@@ -1,2 +1,25 @@
-# dd-trace-php
-Datadog PHP Tracer
+# DD Trace PHP
+
+[![CircleCI](https://circleci.com/gh/DataDog/dd-trace-php/tree/master.svg?style=svg)](https://circleci.com/gh/DataDog/dd-trace-php/tree/master)
+
+PHP APM Client
+
+## Install
+
+```
+composer require datadog/dd-trace
+```
+
+## Contribution
+
+### Run tests
+
+```
+composer test
+```
+
+### Fix lint
+
+```
+composer fix-lint
+```

composer.json

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+{
+    "name": "datadog/dd-trace",
+    "description": "PHP APM Client",
+    "keywords": ["datadog", "php", "tracing"],
+    "type": "library",
+    "license": "BSD-3-Clause",
+    "authors": [
+        {
+            "name": "José Carlos Chávez",
+            "email": "jcchavezs@gmail.com"
+        },
+        {
+            "name": "DataDog",
+            "email": "dev@datadoghq.com",
+            "role": "Developer"
+        }
+    ],
+    "minimum-stability": "dev",
+    "require": {
+        "opentracing/opentracing": "1.0.0-beta2"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "~5.7.19",
+        "squizlabs/php_codesniffer": "3.*"
+    },
+    "autoload": {
+        "psr-4": {
+            "DDTrace\\": "./src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "DDTrace\\Tests\\": "./tests/"
+        }
+    },
+    "scripts": {
+        "test": "./vendor/bin/phpunit tests",
+        "lint": "./vendor/bin/phpcs --standard=ZEND --standard=PSR2 --ignore=*/vendor/* ./",
+        "fix-lint": "./vendor/bin/phpcbf --standard=ZEND --standard=PSR2 --ignore=*/vendor/* ./"
+    }
+}