Create GitHub Action: push-to-release-email (#56)

* Create GitHub-actions-push-demo.yml

* Changes the  demo script

* Added more data to script

* Added Gmail agent

* fixed formatting issues

* Change the agent email

* Changes the filter

* Fixed formatting errors

.github/workflows/push-to-release-email.yml

@@ -0,0 +1,43 @@
+name: Email notfication for upcoming release
+on:
+  push:
+    branches:
+    - release
+jobs:
+  send_email:
+    runs-on: ubuntu-latest
+    name: send_email
+    steps:
+    - name: Send email
+      # You may pin to the exact commit or the version.
+      # uses: dawidd6/action-send-mail@98b61f505d216dafd844f3bfca5b2972df822dab
+      uses: dawidd6/[email protected]
+      with:
+        # Required mail server address:
+        server_address: smtp.gmail.com
+        # Required mail server port:
+        server_port: 465
+        # Required mail server username:
+        username: ${{secrets.MAIL_AGENT_USERNAME}}
+        # Required mail server password:
+        password: ${{secrets.MAIL_AGENT_PASSWORD}}
+        # Required mail subject:
+        subject: Litewallet iOS Release almost ready
+        # Required recipients' addresses:
+        to: [email protected] # [email protected], 
+        # Required sender full name (address can be skipped):
+        from:  <[email protected]> # <[email protected]> Litewallet iOS Github Repo 
+        # Optional whether this connection use TLS (default is true if server_port is 465)
+        secure: true
+        # Optional plain body:
+        body: Build job of ${{github.repository}} completed successfully!
+        # Optional HTML body read from file:
+        html_body: file://README.html
+        # Optional carbon copy recipients:
+        cc: [email protected] 
+        # Optional recipient of the email response:
+        reply_to: [email protected]
+        # Optional unsigned/invalid certificates allowance:
+        ignore_cert: true
+        # Optional converting Markdown to HTML (set content_type to text/html too):
+        convert_markdown: true