renamed GitVersion.js -> GitVersion.ts, added ToolInstaller and ToolLib

src/github/Proxy.ts

@@ -0,0 +1,20 @@
+import { find, cacheDir } from '@actions/tool-cache';
+import { debug, exportVariable, addPath } from '@actions/core';
+import { which } from '@actions/io';
+
+import { isExplicitVersion, evaluateVersions, createTempDir, cleanVersion, executeDotNet } from './ToolLib';
+import { IProxy } from '../Interfaces';
+
+export const Proxy: IProxy = {
+    find : find,
+    debug: debug,
+    exportVariable: exportVariable,
+    addPath: addPath,
+    which: which,
+    cacheDir: cacheDir,
+    isExplicitVersion: isExplicitVersion,
+    evaluateVersions: evaluateVersions,
+    cleanVersion: cleanVersion,
+    createTempDir: createTempDir,
+    executeDotNet: executeDotNet
+}