create burndown chart template and js bundle

app/views/projects/milestones/show.html.haml

@@ -56,5 +56,6 @@
     .alert.alert-success.prepend-top-default
       %span All issues for this milestone are closed. You may close this milestone now.
 
+  = render 'shared/milestones/burndown', milestone: @milestone, project: @project
   = render 'shared/milestones/tabs', milestone: @milestone
   = render 'shared/milestones/sidebar', milestone: @milestone, project: @project, affix_offset: 153

app/views/shared/milestones/_burndown.html.haml

+- milestone = local_assigns[:milestone]
+- project = local_assigns[:project]
+
+- content_for :page_specific_javascripts do
+  = page_specific_javascript_bundle_tag('common_d3')
+  = page_specific_javascript_bundle_tag('burndown_chart')

config/webpack.config.js

@@ -23,6 +23,7 @@ var config = {
     main:                 './main.js',
     blob:                 './blob_edit/blob_bundle.js',
     boards:               './boards/boards_bundle.js',
+    burndown_chart:       './burndown_chart/index.js',
     simulate_drag:        './test_utils/simulate_drag.js',
     cycle_analytics:      './cycle_analytics/cycle_analytics_bundle.js',
     commit_pipelines:     './commit/pipelines/pipelines_bundle.js',
@@ -124,6 +125,7 @@ var config = {
         'graphs',
         'users',
         'monitoring',
+        'burndown_chart',
       ],
     }),