Add a one-click TiddlyWiki (#182)

This commit adds a one-click app definition and logo for [TiddlyWiki].

[TiddlyWiki]: https://tiddlywiki.com/

public/v2/apps/tiddlywiki.json

@@ -0,0 +1,48 @@
+{
+    "captainVersion": "2",
+    "documentation": "Based on https://hub.docker.com/r/nicolaw/tiddlywiki",
+    "displayName": "TiddlyWiki",
+    "description": "TiddlyWiki is a personal wiki and a non-linear notebook for organising and sharing complex information",
+    "dockerCompose": {
+        "version": "3.3",
+        "services": {
+            "$$cap_appname": {
+                "image": "nicolaw/tiddlywiki",
+                "containerHttpPort": "8080",
+                "restart": "always",
+                "volumes": [
+                    "$$cap_appname-data:/var/lib/tiddlywiki"
+                ],
+                "environment": {
+                    "TW_USERNAME": "$$cap_wikusername",
+                    "TW_PASSWORD": "$$cap_wikipassword",
+                    "NODE_MEM": "$$cap_nodemem"
+                }
+            }
+        }
+    },
+    "instructions": {
+        "start": "TiddlyWiki is a personal wiki and a non-linear notebook for organising and sharing complex information. It is an open-source single page application wiki in the form of a single HTML file that includes CSS, JavaScript, and the content. It is designed to be easy to customize and re-shape depending on application. It facilitates re-use of content by dividing it into small pieces called Tiddlers.",
+        "end": "You TiddlyWiki is deployed; it might take a minute to be ready. See https://$$cap_appname.$$cap_root_domain/#HelloThere to get started."
+    },
+    "variables": [
+        {
+            "id": "$$cap_wikusername",
+            "label": "Username",
+            "defaultValue": "anonymous",
+            "description": "Username for authentication (leave blank for a public wiki)"
+        },
+        {
+            "id": "$$cap_wikipassword",
+            "label": "Password",
+            "description": "Password for authentication (leave blank for a public wiki)"
+        },
+        {
+            "id": "$$cap_nodemem",
+            "label": "Max Memory",
+            "defaultValue": "400",
+            "validRegex": "/^[0-9]+$/",
+            "description": "Limit the memory that the server can consume"
+        }
+    ]
+}