First version of GraphQL federation support in PHP

This first version is based on the excellent webonyx/graphql-php and
extends it with the federation spec as provided by Apollo (see
https://www.apollographql.com/docs/apollo-server/federation/federation-spec/)

Author: Pascal de Vink

.gitignore

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+vendor/
+build/
+.phpunit.result.cache

.travis.yml

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+language: php
+sudo: false
+
+php:
+  - '7.3'
+  - nightly
+
+## Build matrix for lowest and highest possible targets
+matrix:
+  include:
+    - php: 7.3
+      env: dependencies=lowest
+    - php: nightly
+      env: dependencies=lowest
+    - php: 7.3
+      env: dependencies=highest
+    - php: nightly
+      env: dependencies=highest
+
+## Update composer and run the appropriate composer command
+before_script:
+  - composer self-update -q
+  - if [ -n "$GH_TOKEN" ]; then composer config github-oauth.github.com ${GH_TOKEN}; fi;
+  - if [ -z "$dependencies" ]; then composer install; fi;
+  - if [ "$dependencies" = "lowest" ]; then composer update --prefer-lowest -n; fi;
+  - if [ "$dependencies" = "highest" ]; then composer update -n; fi;
+  - composer show -i

README

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+{
+    "name": "pascaldevink/graphql-federation",
+    "description": "Utility for creating GraphQL microservices, which can be combined into a single endpoint through tools like Apollo Gateway",
+    "keywords": ["graphql", "federation", "apollo"],
+    "type": "library",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Pascal de vink",
+            "email": "[email protected]"
+        }
+    ],
+    "autoload": {
+        "psr-4": {
+            "PascalDeVink\\GraphQLFederation\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "PascalDeVink\\GraphQLFederation\\Test\\": "tests/"
+        }
+    },
+    "require": {
+        "php": "^7.3",
+        "webonyx/graphql-php": "^0.13.8"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^8.4"
+    }
+}