Update documentation

Docs/Making_Your_Own_Theme.md

@@ -51,9 +51,10 @@ The preferred way to add your theme is via a Pull Request. A Pull Request is les
 2) Go to `assets/themes` and create a new directory `yourtheme`
 3) Create a new file `yourtheme.json`, paste the theme configuration in there. You can find your theme configuration in the customThemeBuilder (the tab with the *Floppy disk* icon)
 4) Copy all the images into this new directory. **No external sources are allowed!** External image sources leak privacy or can break.
-   - Make sure the license is suitable, preferable a Creative Commons license. Attribution can be added at the bottom of this document
-   - If an SVG version is available, use the SVG version
-   - Make sure all the links in `yourtheme.json` are updated. You can use `./assets/themes/yourtheme/yourimage.svg` instead of the HTML link
+    - Make sure the license is suitable, preferable a Creative Commons license or CC0-license.
+    - If an SVG version is available, use the SVG version
+    - Make sure all the links in `yourtheme.json` are updated. You can use `./assets/themes/yourtheme/yourimage.svg` instead of the HTML link
+    - Create a file `license_info.json` in the theme directory, which contains metadata on every artwork source 
  5) Add your theme to the code base:
     - Open [AllKnownLayouts.ts](https://github.com/pietervdvn/MapComplete/blob/master/Customizations/AllKnownLayouts.ts)
     - Add an import statement, e.g. `import * as yourtheme from "../assets/themes/yourtheme/yourthemes.json";`

assets/themes/charging_stations/bicycle.svg.license_info.json

@@ -3,9 +3,9 @@
     "Stijn Wens"
   ],
   "path": "bicycle.svg",
-  "license": "?",
+  "license": "CC0",
   "sources": [
     "https://wens.be/free-antwerpenize-bicycle-font",
     " https://antwerpenize.be/post/634396003556081664/antwerpenize-lettertype"
   ]
-}
+}

tslint.json

@@ -0,0 +1,10 @@
+{
+    "defaultSeverity": "error",
+    "extends": [
+        "tslint:recommended",
+        "tslint-no-circular-imports"
+    ],
+    "jsRules": {},
+    "rules": {},
+    "rulesDirectory": []
+}