Add types for 'karma-chai' package (#16050)

types/karma-chai/index.d.ts

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+// Type definitions for karma-chai 0.1
+// Project: http://xdissent.github.io/karma-chai
+// Definitions by: Jay Sherby <https://github.com/JayAndCatchFire>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+import chai = require('chai');
+
+declare global {
+    var assert: Chai.AssertStatic;
+    var expect: Chai.ExpectStatic;
+    var should: Chai.Should;
+}

types/karma-chai/karma-chai-tests.ts

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+true.should.be.ok;
+expect(true).to.be.ok;
+assert.isTrue(true);

types/karma-chai/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",
+        "karma-chai-tests.ts"
+    ]
+}

types/karma-chai/tslint.json

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