Add the github-linguist package

This commit only adds a single package and all of its transitive
dependencies. The github-linguist package will be used for counting
lines of code as a baseline for databases we are analyzing.

node_modules/github-linguist/README.md

@@ -0,0 +1,71 @@
+# github-linguist
+
+💻 Counts the number of lines of code, written in TypeScript.
+
+**Warning:** This package uses regular expressions to approximate the lines of code in a project. The
+results are not 100% precise because the regular expressions can return mistakes in edge
+cases, for example if comment tokens are present inside of multiline strings.
+
+## Prerequisites
+
+- Node.js 6+
+
+## Install
+
+```bash
+npm install github-linguist
+```
+
+or
+
+```bash
+yarn add github-linguist
+```
+
+## Usage
+
+You can use `loc` in you ternimal, or as a npm package in your projects.
+
+### Command line mode
+
+Supports counting lines of code of a file or directory.
+
+#### 1. Lines of code in a single file
+
+```bash
+# loc file <path>
+loc file src/index.ts
+```
+
+![loc file <path>](https://user-images.githubusercontent.com/3739221/31838697-9fdec114-b5a3-11e7-890e-795444bc9400.png)
+
+#### 2. Lines of code in a directory
+
+```bash
+# loc <pattern>
+loc dir **/*.ts
+```
+
+![loc dir <pattern>](https://user-images.githubusercontent.com/3739221/31838695-9f94a340-b5a3-11e7-914a-91629d2cfa9f.png)
+
+### Third-party mode
+
+```ts
+import { LocFile, LocDir } from 'github-linguist';
+
+// for a file.
+const file = new LocFile(filePath);
+const { info } = file.getInfo();
+
+//  for a directory.
+const dir = new LocDir({
+  cwd: // root directory, or leave blank to use process.cwd()
+  include: // string or string[] containing path patterns to include (default include all)
+  exclude: // string or string[] containing path patterns to exclude (default exclude none)
+});
+const { info } = dir.getInfo();
+```
+
+## License
+
+MIT License.