Update README.md

Author: BaseMax

README.md

@@ -1 +1,39 @@
-# FirstPHPGraphQL
+# FirstPHPGraphQL
+
+## GaphQL Shema
+
+```graphql
+type Query {
+  echo(message: String!): String!
+  sum(x: Int!, y: Int!): Int!
+}
+```
+
+## Using
+
+```
+php -S localhost:8080 ./graphql.php
+```
+
+Open `http://localhost:8080/` at your browser and use.
+
+## Example
+
+```graphql
+{
+  echo(message: "Hello World")
+  sum(x: 2 y:10)
+  s2:sum(x: 2 y:1)
+  s3:sum(x: 2 y:60)
+  s4:sum(x: 2 y:50)
+  s5:sum(x: 2 y:100)
+}
+```
+
+## GraphQL Playground
+
+Installing at arch: `yay graphql-playground-electron`
+
+![](demo.png)
+
+© Copyright Max Base, 2021