Give some love to the linter

lib/lint/README.md

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+![AS](https://avatars1.githubusercontent.com/u/28916798?s=48) lint
+======================
+
+Recommended [TSLint](https://github.com/palantir/tslint) rules for use with AssemblyScript. Meant to spot the most common issues as you type.
+
+Not a sophisticated checker in its current state.
+
+Usage
+-----
+
+Add the following `tslint.json` to your project:
+
+```json
+{
+  "extends": "@assemblyscript/lint"
+}
+```
+
+Add additional rules if necessary.
+
+Add a script to your `package.json`:
+
+```json
+"scripts": {
+  "lint": "tslint -c tslint.json --project ./path/to[/tsconfig.json] --format as"
+}
+```
+
+Now, to check your sources, run:
+
+```
+$> npm run lint
+```
+
+If you are using [Visual Studio Code](https://code.visualstudio.com/), there's also a [TSLint extension](https://marketplace.visualstudio.com/items?itemName=eg2.tslint) that highlights issues as you type.
+
+Custom rules
+------------
+
+* **as-types** checks that all types are annotated or have an initializer.
+* **as-variables** checks the use of `var` and `let` to match their semantic meaning. For reference, `var` becomes a distinct local or mutable global, while `let` becomes a shared local.