Added badges, added Github Actions

.github/workflows/flutter.yml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches:
+      - master
+      - feature/*
+      - bugfix/*
+      - hotfix/*
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/wrapper
+            /opt/hostedtoolcache/flutter
+          key: ${{ runner.OS }}-flutter-install-cache
+      - uses: subosito/flutter-action@v2
+        with:
+          channel: 'stable'
+      - name: Flutter pub get
+        run: flutter pub get
+      - name: Flutter format
+        run: flutter format -o none --set-exit-if-changed .
+      - name: Flutter analyze
+        run: flutter analyze

README.md

@@ -1,3 +1,4 @@
+[![pub package](https://img.shields.io/pub/v/flutter_date_time_picker.svg)](https://github.com/Iconica-Development) [![Build status](https://img.shields.io/github/workflow/status/Iconica-Development/flutter_date_time_picker/CI)](https://github.com/Iconica-Development/flutter_date_time_picker/actions/new) [![style: effective dart](https://img.shields.io/badge/style-effective_dart-40c4ff.svg)](https://github.com/tenhobi/effective_dart) 
 # DateTime Picker
 
 Fluter DateTime Picker is a package you can use to implement an Calandar to pick dates and ust them in your Flutter app.