Add frontend, backend and CLI

backend/src/templates/emailVerification.handlebars

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+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <meta http-equiv="x-ua-compatible" content="ie=edge">
+    <title>Email Verification</title>
+</head>
+<body>
+    <h2>Infisical</h2>
+    <h2>Confirm your email address</h2>
+    <p>Your confirmation code is below — enter it in the browser window where you've started signing up for Infisical.</p>
+    <h2>{{code}}</h2>
+    <p>Questions about setting up Infisical? Email us at [email protected]</p>
+</body>
+</html>

backend/src/templates/organizationInvitation.handlebars

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+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="utf-8">
+    <meta http-equiv="x-ua-compatible" content="ie=edge">
+    <title>Email Verification</title>
+</head>
+<body>
+    <h2>Infisical</h2>
+    <h2>Join your team on Infisical</h2>
+    <p>{{inviterFirstName}}({{inviterEmail}}) has invited you to their Infisical organization — {{organizationName}}</p>
+    <a href="{{callback_url}}?token={{token}}&to={{email}}">Join now</a>
+    <h3>What is Infisical?</h3>
+    <p>Infisical is a simple end-to-end encrypted solution that enables teams to sync and manage their environment
+        variables.</p>
+</body>
+</html>

backend/src/templates/workspaceInvitation.handlebars

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+<!DOCTYPE html>
+<html>
+<head>
+    <meta charset="utf-8">
+    <meta http-equiv="x-ua-compatible" content="ie=edge">
+    <title>Email Verification</title>
+</head>
+<body>
+    <h2>Infisical</h2>
+    <h2>Join your team on Infisical</h2>
+    <p>{{inviterFirstName}}({{inviterEmail}}) has invited you to their Infisical workspace — {{workspaceName}}</p>
+    <a href="{{callback_url}}">Join now</a>
+    <h3>What is Infisical?</h3>
+    <p>Infisical is a simple end-to-end encrypted solution that enables teams to sync and manage their environment variables.</p>
+</body>
+</html>