Add cspell checker

.babelrc.js

@@ -1,7 +1,7 @@
 module.exports = {
   presets: [['@babel/preset-env', { targets: { node: '12' } }]],
   plugins: [
-    './resources/load-staticly-from-npm.js',
+    './resources/load-statically-from-npm.js',
     '@babel/plugin-transform-flow-strip-types',
   ],
   overrides: [

README.md

@@ -165,7 +165,7 @@ the parameters:
   provided raw JSON will always be returned instead of GraphiQL even when
   loaded from a browser.
 
-GraphQL will first look for each parameter in the URL's query-string:
+GraphQL will first look for each parameter in the query string of a URL:
 
 ```
 /graphql?query=query+getUser($id:ID){user(id:$id){name}}&variables={"id":"4"}
@@ -205,7 +205,7 @@ const session = require('koa-session');
 const graphqlHTTP = require('koa-graphql');
 
 const app = new Koa();
-app.keys = ['some secret hurr'];
+app.keys = ['some secret'];
 app.use(session(app));
 app.use(function* (next) {
   this.session.id = 'me';
@@ -259,7 +259,7 @@ const graphqlHTTP = require('koa-graphql');
 
 const app = new Koa();
 
-app.keys = ['some secret hurr'];
+app.keys = ['some secret'];
 app.use(session(app));
 
 const extensions = ({
@@ -365,7 +365,7 @@ router.all(
 );
 ```
 
-[List of available CodeMirror themas](https://codemirror.net/demo/theme.html)
+[List of available CodeMirror themes](https://codemirror.net/demo/theme.html)
 
 or an object with `url` and `name` properties where `url` should lead to
 your custom theme and `name` would be passed to the `GraphiQL`
@@ -392,7 +392,7 @@ For details see the [GraphiQL spec](https://github.com/graphql/graphiql/tree/mas
 
 GraphQL's [validation phase](https://graphql.github.io/graphql-spec/#sec-Validation) checks the query to ensure that it can be successfully executed against the schema. The `validationRules` option allows for additional rules to be run during this phase. Rules are applied to each node in an AST representing the query using the Visitor pattern.
 
-A validation rule is a function which returns a visitor for one or more node Types. Below is an example of a validation preventing the specific fieldname `metadata` from being queried. For more examples see the [`specifiedRules`](https://github.com/graphql/graphql-js/tree/main/src/validation/rules) in the [graphql-js](https://github.com/graphql/graphql-js) package.
+A validation rule is a function which returns a visitor for one or more node Types. Below is an example of a validation preventing the specific field name `metadata` from being queried. For more examples see the [`specifiedRules`](https://github.com/graphql/graphql-js/tree/main/src/validation/rules) in the [graphql-js](https://github.com/graphql/graphql-js) package.
 
 ```js
 import { GraphQLError } from 'graphql';

cspell.json

@@ -0,0 +1,34 @@
+{
+  "language": "en",
+  "ignorePaths": [
+    // Copied from '.gitignore', please keep it in sync.
+    ".eslintcache",
+    "node_modules",
+    "coverage",
+    "dist",
+    "flow-typed",
+    "__tests__",
+
+    // Excluded from spelling check
+    "cspell.json",
+    "package.json",
+    "package-lock.json",
+    "tsconfig.json"
+  ],
+  "words": [
+    "graphiql",
+    "unfetch",
+    "noindex",
+    "codecov",
+    "recognise",
+    "serializable",
+    "subcommand",
+    "charsets",
+    "downlevel",
+
+    // TODO: remove bellow words
+    "Graphi", // GraphiQL
+    "QL's", // GraphQL's
+    "graphql's" // express-graphql's
+  ]
+}