Fix memcached conditional and external database check in init container (#18)

Bump chart version

Update README.md with example for DB

Fix external host check for Databases

Fix condition for memcached in Chart.yaml

Co-authored-by: Lucas Hahn <lucas.hahn@novum-rgi.de>
Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/18
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Andrew Thornton <art27@cantab.net>

README.md

@@ -2,8 +2,6 @@
 
 [Gitea](https://gitea.io/en-us/) is a community managed lightweight code hosting solution written in Go. It is published under the MIT license.
 
-Readme will be updated with examples in the next few days
-
 ## Introduction
 
 This helm chart has taken some inspiration from https://github.com/jfelten/gitea-helm-chart
@@ -49,6 +47,26 @@ Gitea offers lots of configuration. This is fully described in the [Gitea Cheat
       repository.pull-request:
         WORK_IN_PROGRESS_PREFIXES: "WIP:,[WIP]:"
 ```
+### External Database
+
+An external Database can be used instead of builtIn postgresql or mysql.
+
+```yaml
+  gitea:
+    database:
+      builtIn:
+        postgresql:
+          enabled: false
+
+    config:
+      database:
+        DB_TYPE: mysql
+        HOST: 127.0.0.1:3306
+        NAME: gitea
+        USER: root
+        PASSWD: gitea
+      SCHEMA: gitea
+```
 
 ### Ports and external url