Adds elo-rank typings

types/elo-rank/elo-rank-tests.ts

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+import EloRank from 'elo-rank';
+
+var test = new EloRank();
+
+test.getKFactor(); // $ExpectType number
+test.getExpected(1200, 1500);  // $ExpectType number
+test.updateRating(test.getExpected(1200, 1500), 1300, 1500); // $ExpectType number

types/elo-rank/index.d.ts

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+// Type definitions for elo-rank 1.0
+// Project: https://github.com/dmamills/elo-rank#readme
+// Definitions by: Antonio Pavlinovic <https://github.com/apavlinovic>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export class EloRank {
+	constructor(kFactor?: number);
+	
+	setKFactor(kFactor: number): void;
+	getKFactor(): number;
+	getExpected(a: number, b: number): number;
+	
+	updateRating(expected: number, actual: number, current: number): number;
+}

types/elo-rank/tsconfig.json

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

types/elo-rank/tslint.json

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