Add mail functionality into the development branch (#12)

* Added basic code for sending emails
+ Added tests for emails
+ Modified README.md to reflect changes to .env file

* [create-pull-request] push formatted files

* Added dkim

* Fixed mistake in docker-compose.yml

Co-authored-by: Stefan <[email protected]>

src/Tests/mail.test.ts

@@ -0,0 +1,17 @@
+process.env.NODE_ENV = "test";
+
+import chai, { expect } from "chai";
+import chaiaspromised from "chai-as-promised";
+import mail from "../lib/mail";
+
+chai.use(chaiaspromised);
+const should = chai.should();
+
+describe("mail", () => {
+  it("should succesfully send a email", async () => {
+    //NOTE THESE TESTS ONLY WORK WITH DEV BEING TRUE
+    const info = await mail.sendMail('"Chai Testing suite" <[email protected]>', "[email protected]", "Hello", "Test");
+    info.rejected.length.should.eq(0);
+    info.accepted.length.should.eq(1);
+  });
+});