add README

Signed-off-by: gwg313 <gwg313@pm.me>

README.md

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+# Homelab Kubernetes – GitOps Repository
+
+This repository contains the Kubernetes manifests and Helm configurations used to operate my self-hosted infrastructure.
+
+The cluster runs on **Talos OS** and is fully managed using **ArgoCD** with the App-of-Apps pattern.
+
+---
+
+## Overview
+
+All infrastructure and applications are declaratively defined in this repository.
+
+Core components:
+
+- Talos OS (Kubernetes distribution)
+- ArgoCD (GitOps controller)
+- Sealed Secrets (encrypted secret management)
+- cert-manager (certificate automation)
+- Istio (Gateways for ingress and reverse proxy)
+- MetalLB (bare-metal load balancing)
+
+---
+
+## Repository Structure
+
+```
+├── apps/
+├── audiobookshelf/
+├── bytestash/
+├── cert-manager/
+├── cluster-issuer/
+├── focalboard/
+├── forgejo/
+├── harbor-config/
+├── hedgedoc/
+├── karakeep/
+├── linkwarden/
+├── metallb/
+├── minio/
+├── navidrome/
+├── sealed-secrets/
+├── security/
+├── stirling-pdf/
+├── woodpecker/
+├── yopass/
+└── root-app.yaml
+```
+
+Each application directory contains the manifests or Helm values required to deploy the service.
+
+`root-app.yaml` bootstraps all applications via ArgoCD.
+
+---
+
+## GitOps Structure
+
+- `root-app.yaml` defines the parent ArgoCD application.
+- Child applications are defined under `apps/`.
+- Infrastructure components and services are separated by directory.
+- The repository represents the desired state of the cluster.
+
+---
+
+## Secrets Management
+
+Secrets are managed using **Bitnami Sealed Secrets**.
+
+- Plain Kubernetes Secrets are sealed using `kubeseal`.
+- Only encrypted SealedSecret resources are committed to Git.
+- The Sealed Secrets controller decrypts them inside the cluster.
+
+No unencrypted secrets are stored in this repository.
+
+---
+
+## Networking
+
+### Load Balancing
+
+MetalLB provides external IP addresses for services in the bare-metal cluster.
+
+### Ingress & Reverse Proxy
+
+Istio Gateways are used to expose services externally and handle reverse proxy functionality.
+
+### TLS
+
+cert-manager manages certificate issuance and renewal using configured ClusterIssuers.