add docs for ingress tls with vault

docs/README.ingress-tls.md

@@ -0,0 +1,9 @@
+# Using Secrets Store CSI to Enable NGINX Ingress Controller with TLS
+
+The Secrets Store CSI Driver can be used to enable applications to work with NGINX Ingress Controller with TLS stored in an External Secrets Store. 
+For more information on securing an Ingress with TLS, refer to: https://kubernetes.io/docs/concepts/services-networking/ingress/#tls
+
+Checkout provider samples on how to get started -
+
+- [Using Secrets Store CSI and Azure Key Vault Provider](https://github.com/Azure/secrets-store-csi-driver-provider-azure/blob/master/sample/ingress-controller/README.md)
+- [Using Secrets Store CSI and Hashicorp Vault Provider](https://github.com/hashicorp/secrets-store-csi-driver-provider-vault/blob/master/sample/ingress-controller/README.md)

ingress-tls.crt

@@ -0,0 +1,18 @@
+-----BEGIN CERTIFICATE-----
+MIIC2DCCAcACCQDvaF+AC+HGNjANBgkqhkiG9w0BAQsFADAuMRYwFAYDVQQDDA1k
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+LRuTbtMoOHVEppuB
+-----END CERTIFICATE-----

ingress-tls.key

@@ -0,0 +1,28 @@
+-----BEGIN PRIVATE KEY-----
+MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQC1oNjIGy6hlUKA
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+1q3amWXPK4kENxxEJpcI82c=
+-----END PRIVATE KEY-----