chore: add proper README

Author: Kovacs Alex

README.md

@@ -1 +1,27 @@
 # action-build-typescript
+A GitHub action that can be used to build TypeScript code and then push that built code to a different branch
+
+## Usage
+```yml
+name: Build
+on: 
+    push: 
+        branches:
+            - master
+jobs:
+    build:
+        runs-on: ubuntu-latest
+        steps: 
+            - name: Checkout project
+              uses: actions/checkout@v2
+            - name: Setup Node.js
+              uses: actions/setup-node@v2.1.4
+              with:
+                node-version: 12
+            - name: Build and push
+              uses: alexthemaster/action-build-typescript@latest
+              with:
+                pushToBranch: true # optional; can either be true or false | defaults to false
+                branch: 'dist' # optional; the name of the branch the action should push the compiled code to | defaults to dist
+                githubToken: ${{ secrets.GITHUB_TOKEN }} # required if you use the pushToBranch option
+```