Adds definitions for react-svg (#23905)

* adds definition for react-svg

* changed typescript version to 2.6

* make it work with require

* fixed lint error

types/react-svg/index.d.ts

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+// Type definitions for react-svg 2.2
+// Project: https://github.com/atomic-app/react-svg
+// Definitions by: Chen Junda <https://github.com/viccrubs>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.6
+
+import * as React from "react";
+
+declare class ReactSVG extends React.Component<ReactSVG.ReactSVGProps> {}
+
+export = ReactSVG;
+
+declare namespace ReactSVG {
+  interface ReactSVGProps {
+    /**
+     * Path to the SVG.
+     */
+    path: string;
+    /**
+     * Function to call after the SVG is injected. Receives the newly injected SVG DOM element as a parameter. Defaults to null.
+     */
+    callback?: (dom: SVGSVGElement) => void;
+    /**
+     * Class name to be added to the SVG. Defaults to ''.
+     */
+    className?: string;
+    /**
+     * Class name to be added to the wrapping div. Defaults to ''.
+     */
+    wrapperClassName?: string;
+    /**
+     * Run any script blocks found in the SVG (always, once, or never). Defaults to never.
+     */
+    evalScripts?: 'always' | 'once' | 'never';
+    /**
+     * Inline styles to be added to the SVG. Defaults to {}.
+     */
+    style?: any;
+  }
+}

types/react-svg/react-svg-tests.tsx

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+import * as React from 'react';
+import * as ReactDOM from 'react-dom';
+import ReactSVG = require("react-svg");
+
+const complete = <ReactSVG
+    path={"atomic.svg"}
+    callback={svg => {}}
+    className="class-name"
+    wrapperClassName="wrapper-class-name"
+    evalScripts="once"
+    style={{}}
+  />;
+
+const minimal = <ReactSVG path={"test.svg"}/>;

types/react-svg/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "jsx": "react",
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-svg-tests.tsx"
+    ]
+}

types/react-svg/tslint.json

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+{ "extends": "dtslint/dt.json" }