GitHub actions (#167)

* added a github workflow for closing stale issues

* added github PR validation workflows

* fixed the dictionary validator missing digits in words

* fixed the build failing completely when there no git tags

* updated androidx.room 2.4.3 -> 2.5.0

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: Build the Project
+
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    # setup
+    - name: Checkout project sources
+      uses: actions/checkout@v2
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v2
+
+    # validation
+    - name: Validate Dictionaries
+      run: ./gradlew validateDictionaries
+    - name: Build Release APK
+      run: ./gradlew assemble