Translate main index (#40)

* Tranlate documentation

.gitignore

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+.vs

docs/en/index.md

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+# GraphQL library for PHP
+
+Library is based on library [webonyx/graphql-php](https://github.com/webonyx/graphql-php).
+
+Currently realized integrations with the following framework's:
+- [spiral/framework](https://spiral.dev/) under control [RoadRunner](https://roadrunner.dev/). For more information about installation and setup, see [relevant documentation section](spiral/index.md)

docs/en/spiral/abstract-enum-type.md

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+# Abstract class AbstractEnumType
+
+The abstract class `Andi\GraphQL\Type\AbstractEnumType` allows you to define GraphQL enum types
+without the need to implement methods of auxiliary interfaces. Most interfaces are already
+implemented in an abstract class, you just need to set the values ​​of its properties to determine
+the result of the implemented methods.
+
+An example of an abstract class implementation:
+
+```php
+namespace App\GraphQL\Type;
+
+use Andi\GraphQL\Type\AbstractEnumType;
+
+final class CoinSides extends AbstractEnumType
+{
+    protected string $name = 'CoinSides';
+
+    protected iterable $values = [
+        'heads' => true,
+        'tails' => [
+            'value' => false,
+            'description' => 'Tails of coin',
+        ],
+    ];
+}
+```
+
+When implementing a GraphQL enum type using the abstract class `AbstractEnumType` you must
+determine the values ​​of the following properties: 
+
+<table>
+    <tr>
+        <th>Name</th>
+        <th>Type</th>
+        <th>Description</th>
+    </tr>
+    <tr>
+        <td valign="top"><code>$name</code></td>
+        <td valign="top"><code>string</code></td>
+        <td valign="top">Enum type name, <b>required</b>, must be defined.</td>
+    </tr>
+    <tr>
+        <td valign="top"><code>$description</code></td>
+        <td valign="top"><code>string</code></td>
+        <td valign="top">
+            Enum type description displayed in GraphQL schema.
+            Don't define a value unless a description is needed.
+        </td>
+    </tr>
+    <tr>
+        <td valign="top"><code>$values</code></td>
+        <td valign="top"><code>iterable</code></td>
+        <td valign="top">
+            <p>List of enum items ​​of an enumerated type. <b>Required</b>, must be defined.</p>sc
+            <p>Requirements for elements of an iterable property are below.</p>
+        </td>
+    </tr>
+</table>
+
+## Defining an iterable property `$values`
+
+```php
+// Each element of the iterable property $values can be:
+$this->values = [
+    // an instance of a class that implements an interface EnumValueInterface
+    new class implements EnumValueInterface {...},
+
+    // string with a numeric index.
+    // In this case, this string will be used as the name and value.
+    'red',
+
+    // key => value. This structure is interpreted as follows:
+    //   key - possible value name (used in GraphQL queries);
+    //   value - the corresponding value used in php.
+    // With this configuration:
+    // if a possible value was specified in the GraphQL request 'green',
+    // in php it will be converted to '#00FF00'.
+    // Any data type is acceptable (Including Objects).
+    'green' => '#00FF00',
+
+    // an associative array in the form of a configuration of possible values
+    'blue' => [
+        // If the 'name' configuration option is omitted (as in this example), as the possible name for the value
+        // the structure key will be used, in this case 'blue'.
+        // 'name' => 'sapphirine',
+
+        // An optional option that specifies an internal (in PHP) value. Any data type is acceptable.
+        // If there is no configuration option, the name of the possible value will be used as the value.
+        'value' => '#0000FF',
+
+        // Description of a possible value used for display in a GraphQL schema.
+        // This option is not required.
+        'description' => 'EnumValue description',
+
+        // This option is not required. You should define the value of the option if in the GraphQL schema
+        // it is required to indicate the reason why this possible enumeration value is
+        // not recomended.
+        'deprecationReason' => 'This enum value is deprecated. Do not use it.',
+    ],
+];
+```
+
+Total: protected property `$values`, has an iterable structure. It can contain following elements:
+- an instance of a class that implements an interface `EnumValueInterface`;
+- `'key' => 'value'`, where the string key will be used as the name of the possible value
+  (the name used in GraphQL queries), and the value is the value used in php;
+- associative array of configuration options' possible value.
+
+Possible value configuration options can be as follows:
+
+<table>
+    <tr>
+        <th>Option</th>
+        <th>Type</th>
+        <th>Description</th>
+    </tr>
+    <tr>
+        <td valign="top"><code>name</code></td>
+        <td valign="top"><code>string</code></td>
+        <td valign="top">
+            Name of possible value (used in GraphQL queries).
+            If not specified, the key of the iterable structure will be used as the name.
+        </td>
+    </tr>
+    <tr>
+        <td valign="top"><b><code>value</code></b></td>
+        <td valign="top"><code>mixed</code></td>
+        <td valign="top">
+            <p>Optional option that specifies the value available in php.</p>
+            <p>If the option is not specified, the name of the possible value will be used.</p>
+        </td>
+    </tr>
+    <tr>
+        <td valign="top"><code>description</code></td>
+        <td valign="top"><code>string</code></td>
+        <td valign="top">Description of possible value.</td>
+    </tr>
+    <tr>
+        <td valign="top"><code>deprecationReason</code></td>
+        <td valign="top"><code>string</code></td>
+        <td valign="top">
+            If the option is set, then in the GraphQL schema the possible enumeration value will be marked as deprecation.
+            The reason will be indicated as the value of this option.
+        </td>
+    </tr>
+</table>