Add Types for package react-native-base64 (#47127)

Co-authored-by: evan <evanjin@toons.kr>

types/react-native-base64/index.d.ts

@@ -0,0 +1,12 @@
+// Type definitions for react-native-base64 0.1
+// Project: https://github.com/eranbo/react-native-base64#readme
+// Definitions by: seongjoojin <https://github.com/seongjoojin>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+interface Base64 {
+    encode: (input: string) => string;
+    decode: (input: string) => string;
+}
+
+declare const base64: Base64;
+export = base64;

types/react-native-base64/react-native-base64-tests.tsx

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+import base64 from 'react-native-base64';
+
+base64.encode('Some string to encode to base64');
+base64.decode('SW4gbXkgZXllcywgaW5kaXNwb3NlZA0KSW4gZGlzZ3Vpc2VzIG5vIG9uZSBrbm93cw0KUklQIEND==');

types/react-native-base64/tsconfig.json

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+{
+  "compilerOptions": {
+    "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "allowSyntheticDefaultImports": true,
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+  },
+  "files": ["index.d.ts", "react-native-base64-tests.tsx"]
+}

types/react-native-base64/tslint.json

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