[react-native-modal-dropdown] Add definitions (#31735)

* react-native-modal-dropdown: initial definitions

* fix the project path and export class

* fix member-access

types/react-native-modal-dropdown/index.d.ts

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+// Type definitions for react-native-modal-dropdown 0.6
+// Project: https://github.com/sohobloo/react-native-modal-dropdown
+// Definitions by: Carlos Li <https://github.com/echoulen>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.8
+
+import * as React from "react";
+
+import ModalDropdown = RNModalDropdown.ModalDropdown;
+export = ModalDropdown;
+
+declare namespace RNModalDropdown {
+    interface PositionStyle {
+        left?: number;
+        right?: number;
+        width?: number;
+    }
+    interface ModalDropdownProps {
+        disabled?: boolean;
+        defaultIndex?: number;
+        defaultValue?: string;
+        options?: any[];
+        animated?: boolean;
+        showsVerticalScrollIndicator?: boolean;
+        style?: any;
+        textStyle?: any;
+        dropdownStyle?: any;
+        dropdownTextStyle?: any;
+        dropdownTextHighlightStyle?: any;
+        adjustFrame?: (positionStyle: PositionStyle) => void;
+        renderRow?: (option: any, index: number, isSelected: boolean) => any;
+        renderSeparator?: () => any;
+        renderButtonText?: (text: any) => any;
+        onDropdownWillShow?: () => boolean;
+        onDropdownWillHide?: () => boolean;
+        onSelect?: (index: number, option: any) => void;
+        accessible?: boolean;
+        keyboardShouldPersistTaps?: "always" | "never" | "handled";
+    }
+
+    class ModalDropdown extends React.Component<ModalDropdownProps> {
+        static default: typeof ModalDropdown;
+    }
+}

types/react-native-modal-dropdown/react-native-modal-dropdown-tests.tsx

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+import * as React from 'react';
+import ModalDropdown from "react-native-modal-dropdown";
+
+class Test extends React.Component<any> {
+    render() {
+        return (
+            <ModalDropdown options={["option 1", "option 2"]}/>
+        );
+    }
+}

types/react-native-modal-dropdown/tsconfig.json

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

types/react-native-modal-dropdown/tslint.json

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