Kanban board (#8346)

Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: jaqra <48099350+jaqra@users.noreply.github.com>
Co-authored-by: Kerry <flatline-studios@users.noreply.github.com>
Co-authored-by: Jaqra <jaqra@hotmail.com>
Co-authored-by: Kyle Evans <kevans91@users.noreply.github.com>
Co-authored-by: Tsakiridis Ilias <TsakiDev@users.noreply.github.com>
Co-authored-by: Ilias Tsakiridis <ilias.tsakiridis@outlook.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

templates/repo/settings/options.tmpl

@@ -269,6 +269,21 @@
 					</div>
 				</div>
 
+				<div class="ui divider"></div>
+
+				{{$isProjectsEnabled := .Repository.UnitEnabled $.UnitTypeProjects}}
+				<div class="inline field">
+					<label>{{.i18n.Tr "repo.project_board"}}</label>
+					{{if .UnitTypeProjects.UnitGlobalDisabled}}
+					<div class="ui checkbox poping up disabled" data-content="{{.i18n.Tr "repo.unit_disabled"}}">
+					{{else}}
+					<div class="ui checkbox">
+					{{end}}
+						<input class="enable-system" name="enable_projects" type="checkbox" {{if $isProjectsEnabled}}checked{{end}}>
+						<label>{{.i18n.Tr "repo.settings.projects_desc"}}</label>
+					</div>
+				</div>
+
 				{{if .Repository.CanEnablePulls}}
 					<div class="ui divider"></div>
 					{{$pullRequestEnabled := .Repository.UnitEnabled $.UnitTypePullRequests}}