Create README.md

Author: rasmusjp

README.md

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+# Umbraco GraphQL
+
+## What is this
+An experimental implementation of [GraphQL](https://graphql.org) for Umbraco using [GraphQL for .NET](https://github.com/graphql-dotnet/graphql-dotnet).
+
+Please note this **should not be used in production**, since there a **no security** and all you data will be **publicly available**.
+
+## How does it work
+An Owin middleware exposes Umbraco Published Content as a GraphQL endpoint.
+
+GraphQL types are dynamically generated for all Umbraco document types (content and media), with all the properties as fields. They all implement an interface `PublishedContent` which implements the generic Umbraco properties as fields.
+
+If a document type is alloweded at root, a field on the query is generated with the same name as the document type alias.
+
+There are also two generic fields `content(id: ID!)` and `contentAtRoot` which can be used to query by `id` or getting all root content.
+
+## Getting started
+Clone the repository and run the Website (F5 in Visual Studio), install Umbraco with the starter kit and start exploring the API using GraphiQL by opening `/umbraco/graphiql`.
+
+There's also a [downloaded](https://drive.google.com/file/d/1L67kZV7u6tXy45zknLih421Rlbrx3fh3/view) which contains a prebuilt website with some sample data based on the starter kit. Login `[email protected]`/`1234567890`. It's based on the Umbraco starter kit, where `People`, `Products` and `Blog` has been moved to the root of the tree.
+
+### Urls
+| Url | Description |
+| --- | ----------- |
+| /umbraco/graphiql | GraphiQL interface |
+| /umbraco/graphql | GraphQL endpoint |
+| /umbraco/graphql/schema | The generated schema |
+
+### Querying
+Query examples based on the download above
+
+```graphql
+{
+  people {
+    pageTitle
+    children {
+      items {
+        ... on Person {
+          name
+          department
+          photo {
+            url
+          }
+        }
+      }
+    }
+  }
+}
+```
+
+We can also do some simple filtering and sorting, ([Inspired by the Grahpcool filtering](https://www.graph.cool/docs/reference/graphql-api/query-api-nia9nushae#query-arguments)) like geting all children of people that starts with the letter `J`
+```graphql
+{
+  people {
+    pageTitle
+    peopleStartsWithJ:children(filter: { name_starts_with:"J"}, orderBy: name_ASC) {
+      items {
+        ... on Person {
+          name
+          department
+          photo {
+            url
+          }
+        }
+      }
+    }
+  }
+}
+```
+
+And even query for multiple roots at the same time
+```graphql
+{
+  people {
+    pageTitle
+    peopleStartsWithJ: children(filter: {name_starts_with: "J"}, orderBy: name_ASC) {
+      items {
+        ...SimplePerson
+      }
+    }
+  }
+  products {
+    pageTitle
+    defaultCurrency
+    featuredProducts {
+      ...SimpleProduct
+    }
+    children {
+      items {
+        ...SimpleProduct
+      }
+    }
+  }
+}
+
+fragment SimplePerson on Person {
+  name
+  department
+  photo {
+    url
+  }
+}
+
+fragment SimpleProduct on Product {
+  name
+  price
+  sku
+  photos {
+    url
+  }
+}
+
+```