#0000 - Add cert-manager setup, license, and update README

Introduce a `ClusterIssuer` resource for cert-manager to enable Let's Encrypt integration with Traefik. Add an MIT license for the project and clarify the purpose of the repository in the README.

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Guillaume 'B.B.' Van Hemmen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,3 +1,3 @@
 # core
 
-the core setup of the cluster
+A collection of "core" application that run the cluster.

cert-manager.yaml

@@ -0,0 +1,18 @@
+apiVersion: cert-manager.io/v1
+kind: ClusterIssuer
+metadata:
+  name: acme-lets-encrypt-http
+  namespace: cert-issuer
+spec:
+  acme:
+    email: acme@van-hemmen.com
+    # We use the staging server here for testing to avoid hitting
+    server: https://acme-v02.api.letsencrypt.org/directory
+    privateKeySecretRef:
+      # if not existing, it will register a new account and stores it
+      name: production-issuer-account-key
+    solvers:
+      - http01:
+          # The ingressClass used to create the necessary ingress routes
+          ingress:
+            class: traefik