MAPG-97 add Leaflet

public/static/.gitignore

@@ -0,0 +1 @@
+node_modules

public/static/package.json

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+{
+  "dependencies": {
+    "leaflet": "^1.6.0"
+  }
+}

public/static/yarn.lock

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+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+leaflet@^1.6.0:
+  version "1.6.0"
+  resolved "https://registry.yarnpkg.com/leaflet/-/leaflet-1.6.0.tgz#aecbb044b949ec29469eeb31c77a88e2f448f308"
+  integrity sha512-CPkhyqWUKZKFJ6K8umN5/D2wrJ2+/8UIpXppY7QDnUZW5bZL5+SEI2J7GBpwh4LIupOKqbNSQXgqmrEJopHVNQ==