Added env example file (#71)

.env-example

@@ -0,0 +1,18 @@
+# Since .env is gitignored, you can use .env-example to build a new `.env` file when you clone the repo.
+# Keep this file up-to-date when you add new variables to `.env`.
+
+# This file will be committed to version control, so make sure not to have any secrets in it.
+# If you are cloning this repo, create a copy of this file named `.env` and populate it with your secrets.
+
+# When adding additional env variables, the schema in /env/schema.mjs should be updated accordingly
+
+# Prisma
+DATABASE_URL=
+
+# Next Auth
+NEXTAUTH_SECRET=
+NEXTAUTH_URL=
+
+# Next Auth Google Provider
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=