Implement first custom linter rule async-suffix

packages/tslint-config/rules/asyncSuffixRule.ts

@@ -0,0 +1,10 @@
+import * as Lint from 'tslint';
+import * as ts from 'typescript';
+
+import {AsyncSuffixWalker} from './walkers/async_suffix';
+
+export class Rule extends Lint.Rules.AbstractRule {
+    public apply(sourceFile: ts.SourceFile): Lint.RuleFailure[] {
+        return this.applyWithWalker(new AsyncSuffixWalker(sourceFile, this.getOptions()));
+    }
+}