docs: Add installation docs

charts/namada-indexer/README.md

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+# Namada Indexer Helm Chart
+
+A Helm chart for deploying the Namada blockchain indexer and its components.
+
+## Overview
+
+This chart deploys a complete Namada indexing solution including:
+
+- Chain indexer
+- Governance indexer
+- PoS indexer
+- Rewards indexer
+- Parameters indexer
+- Transaction indexer
+- Web API server
+- PostgreSQL database (optional)
+- Redis cache (optional)
+
+## Prerequisites
+
+- Helm 3.2.0+
+- Ingress Controller (nginx)
+- Cert-manager (optional, for TLS)
+
+## Installation
+
+1. Add required Helm repositories:
+
+```bash
+helm repo add bitnami https://charts.bitnami.com/bitnami
+helm repo add zalando https://opensource.zalando.com/postgres-operator/charts/postgres-operator
+helm repo update
+```
+
+2. Update chart dependencies:
+
+```bash
+helm dependency update .
+helm dependency build .
+```
+
+3. Install the chart:
+
+```bash
+helm install namada-indexer . \
+  --create-namespace \
+  --namespace namada-indexer \
+  -f values.yaml
+```
+
+For a basic installation with default values:
+
+```bash
+helm install namada-indexer . \
+  --create-namespace \
+  --namespace namada-indexer
+```
+
+To upgrade an existing installation:
+
+```bash
+helm upgrade namada-indexer . \
+  --namespace namada-indexer \
+  -f values.yaml
+```
+
+## Configuration
+
+### Database Configuration
+
+#### Option 1: Built-in PostgreSQL
+
+```yaml
+postgresOperator:
+  install:
+    enabled: true
+  enabled: true
+  teamId: "namada"
+  volume:
+    size: 100Gi
+    storageClass: "oci-bv"
+  numberOfInstances: 3
+```
+
+#### Option 2: External PostgreSQL
+
+```yaml
+postgresOperator:
+  install:
+    enabled: false
+  enabled: false
+
+externalPostgres:
+  enabled: true
+  host: "your-postgres-host"
+  port: "5432"
+  credentialSecret:
+    name: "your-postgres-secret"
+```
+
+### Redis Configuration
+
+#### Option 1: Built-in Redis (Default)
+
+```yaml
+redis:
+  install:
+    enabled: true
+  enabled: true
+  architecture: replication
+  sentinel:
+    enabled: true
+    quorum: 2
+  replica:
+    replicaCount: 3
+```
+
+#### Option 2: External Redis
+
+```yaml
+redis:
+  install:
+    enabled: false
+  enabled: false
+
+externalRedis:
+  enabled: true
+  host: "your-redis-host"
+  port: "6379"
+```
+
+### Indexer Configuration
+
+```yaml
+configmaps:
+  config:
+    data:
+      TENDERMINT_URL: "http://your-tendermint-rpc:26657/"
+
+containers:
+  chain:
+    resources:
+      limits:
+        cpu: "1"
+        memory: "1Gi"
+  webserver:
+    ingress:
+      enabled: true
+      hosts:
+        - host: api.your-domain.com
+```
+
+## Dependencies
+
+This chart depends on:
+
+- PostgreSQL Operator (optional)
+- Redis (optional)
+
+## Contributing
+
+[Contributing guidelines](CONTRIBUTING.md)
+
+## License
+
+Apache 2.0