Add smalltalk samples

(Issue: https://github.com/github/linguist/issues/3244)

samples/Smalltalk/baselineDependency.st

@@ -0,0 +1,8 @@
+dependencies
+neoJSON: spec
+	spec
+		configuration: 'NeoJSON'
+		with: [ spec
+				className: 'ConfigurationOfNeoJSON';
+				version: #stable;
+				repository: 'http://smalltalkhub.com/mc/SvenVanCaekenberghe/Neo/main' ]

samples/Smalltalk/categories.st

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+SystemOrganization addCategory: #ChartJs!
+SystemOrganization addCategory: 'ChartJs-Component'!
+SystemOrganization addCategory: 'ChartJs-Demo'!
+SystemOrganization addCategory: 'ChartJs-Exception'!
+SystemOrganization addCategory: 'ChartJs-Library'!
+SystemOrganization addCategory: 'ChartJs-Model'!
+SystemOrganization addCategory: 'ChartJs-Style'!
+SystemOrganization addCategory: 'ChartJs-Types'!

samples/Smalltalk/renderSeasideExampleOn..st

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+rendering
+renderTitleId: divId on: html
+	^ html div
+		id: #title , divId;
+		class: #aClass;
+		with: [ 
+					html heading
+						level3;
+						with: self data title ]

samples/Smalltalk/scriptWithPragma.st

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+helpers
+installGitFileTree
+	"GitFileTree is the tool we will use to commit on GitHub."
+
+	<script>
+	Metacello new
+		baseline: 'FileTree';
+		repository:
+			'github://dalehenrich/filetree:pharo' , SystemVersion current dottedMajorMinor
+				, '_dev/repository';
+		load: 'Git'

samples/Smalltalk/smallMethod.st

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+ChartJs
+dataFunction
+	^ 'bars'