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/dist/directory.d.ts

@@ -0,0 +1,28 @@
+import { LineInfo } from './file';
+export interface LocDirOptions {
+    cwd?: string;
+    include?: string[] | string;
+    exclude?: string[] | string;
+}
+export interface LocResult {
+    files: string[];
+    info: LineInfo;
+    languages: {
+        [key: string]: LineInfo & {
+            sum: number;
+        };
+    };
+}
+/**
+ * Collect the info of a directory.
+ */
+export declare class LocDir {
+    private cwd;
+    private include;
+    private exclude;
+    constructor(options: LocDirOptions);
+    /**
+     * Calculate directory info.
+     */
+    loadInfo(): Promise<LocResult>;
+}