Add Papermerge (#458)

* Add Papermerge

Papermerge is an open source document management system (DMS) primarily designed for archiving and retrieving your digital documents. Instead of having piles of paper documents all over your desk, office or drawers - you can quickly scan them and configure your scanner to directly upload to Papermerge DMS.

* Formatted Yml

public/v4/apps/papermerge.yml

@@ -0,0 +1,41 @@
+captainVersion: 4
+services:
+    $$cap_appname:
+        image: linuxserver/papermerge:$$cap_papermerge_version
+        environment:
+            TZ: $$cap_tz
+            PUID: '1000'
+            PGID: '1000'
+            REDIS_URL: $$cap_redis_url
+        restart: unless-stopped
+        volumes:
+            - $$cap_appname-config:/config
+            - $$cap_appname-data:/data
+        caproverExtra:
+            containerHttpPort: '8000'
+caproverOneClickApp:
+    variables:
+        - id: $$cap_papermerge_version
+          label: Paper Merge Version
+          defaultValue: v2.0.1-ls10
+          description: Check out their Docker page for the valid tags https://hub.docker.com/r/linuxserver/papermerge/tags.
+          validRegex: /^([^\s^\/])+$/
+        - id: $$cap_tz
+          label: Time Zone
+          defaultValue: Asia/Kolkata
+          description: Get yours from https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
+          validRegex: /.{1,}/
+        - id: $$cap_redis_url
+          label: Redis URL
+          defaultValue: ''
+          description: Specify an external redis instance to use. Can optionally include a port (redis:6379) and/or db (redis/foo). If left blank or not included, will use a built-in redis instance. If changed after initial setup will also require manual modification of /config/settings.py
+    instructions:
+        start: |-
+            Papermerge is an open source document management system (DMS) primarily designed for archiving and retrieving your digital documents. Instead of having piles of paper documents all over your desk, office or drawers - you can quickly scan them and configure your scanner to directly upload to Papermerge DMS.
+        end: |-
+            Default login is admin:admin via the webui, accessible at http://$$cap_appname.$$cap_root_domain.
+            Wait for few minutes to build and configure the app.
+    displayName: Papermerge
+    isOfficial: true
+    description: Papermerge is an open source document management system (DMS) primarily designed for archiving and retrieving your digital documents.
+    documentation: Taken from https://hub.docker.com/r/linuxserver/papermerge. Website -  https://www.papermerge.com/