Improve README installation documentation (#15)

Add line about how to install the library using composer.
softonic · Jul 4, 2018 · 50e4621 · 50e4621
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commit 50e4621
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diff --git a/README.md b/README.md
@@ -10,6 +10,14 @@ PHP GraphQL Client
 
 PHP Client for [GraphQL](http://graphql.org/)
 
+Installation
+-------
+
+Via composer:
+```
+composer require softonic/graphql-client
+```
+
 Documentation
 -------