Add example content of Labs section.

content/labs/leaflet-js/001-leaflet-js-tutorial.md

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+title="Leaflet.jsでMapboxのタイルを用いて地図を表示する"
+date=2019-04-08
+publishdate=2019-04-08
+Description="Leaflet.jsでMapboxのタイルを用いて地図を表示するよ"
+image="https://farm9.staticflickr.com/8462/29581774242_bf25a0a820_z.jpg"
+leaflet=true
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+
+[Leaflet.js](https://leafletjs.com/)でMapboxのタイルを用いて地図を表示してみます:
+
+<div id="mapid"></div>
+
+<script>
+  var mymap = L.map('mapid').setView([35.7142, 139.7774], 13)
+
+  L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1Ijoia2F6dTYzNCIsImEiOiJjanU4OHg0YjIyMjcxNDNsb2dnM2k5bHhqIn0.dsjWTh-G_TcJ9bOGWLvT2Q', {
+    attribution: 'Map data &copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
+    maxZoom: 18,
+    id: 'mapbox.streets',
+    accessToken: 'pk.eyJ1Ijoia2F6dTYzNCIsImEiOiJjanU4OHg0YjIyMjcxNDNsb2dnM2k5bHhqIn0.dsjWTh-G_TcJ9bOGWLvT2Q'
+  }).addTo(mymap);
+
+  var marker = L.marker([35.7142, 139.7774]).addTo(mymap);
+  marker.bindPopup("<b>Hello world!</b><br>I am a popup.").openPopup();
+</script>
+
+## コード
+こんな感じになります:
+
+```
+<div id="mapid"></div>
+
+<script>
+  var mymap = L.map('mapid').setView([35.7142, 139.7774], 13)
+
+  L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=<access_token>' {
+    attribution: 'Map data &copy; <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
+    maxZoom: 18,
+    id: 'mapbox.streets',
+    accessToken: 'access_token'
+  }).addTo(mymap);
+
+  var marker = L.marker([35.7142, 139.7774]).addTo(mymap);
+  marker.bindPopup("<b>Hello world!</b><br>I am a popup.").openPopup();
+</script>
+```
+