Add some sample query examples

src/docs/samples.md

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+## Term count
+
+```sparql
+# counts  all defined terms in the triple store
+
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+
+SELECT (NOW() AS ?date) (xsd:integer(COUNT(?term)) AS ?count)
+WHERE {
+    ?term a <http://schema.org/DefinedTerm> .
+}
+```
+
+## Instance count
+
+```sparql
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+
+SELECT (NOW() AS ?date) ?type (xsd:integer(COUNT(?s)) AS ?count)
+WHERE {
+  ?subject a ?type .
+}
+GROUP BY ?type
+ORDER BY ?type
+```
+
+## Resource count
+
+```sparql
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+
+SELECT (NOW() AS ?date) (xsd:integer(COUNT(DISTINCT ?resource)) AS ?count)
+WHERE {
+  ?resource ?p ?o .
+}
+```
+
+## Triple count
+
+```sparql
+# counts all triples in a triple store and returns
+# the total number together with a current timestamp
+
+PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
+
+SELECT (NOW() AS ?date) (xsd:integer(COUNT(*)) AS ?count) WHERE {
+   ?s ?p ?o
+}
+
+```
+
+## Service Queries
+
+```sparql
+# shmarql-view: barchart
+#
+PREFIX cto: <https://w3id.org/cto#>
+PREFIX ct: <http://data.linkedct.org/resource/linkedct/>
+PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
+PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
+PREFIX owl: <http://www.w3.org/2002/07/owl#>
+PREFIX schema: <http://schema.org/>
+PREFIX wd: <http://www.wikidata.org/entity/>
+PREFIX wdt: <http://www.wikidata.org/prop/direct/>
+PREFIX wikibase: <http://wikiba.se/ontology#>
+PREFIX bd: <http://www.bigdata.com/rdf#>
+PREFIX foaf: <http://xmlns.com/foaf/0.1/>
+PREFIX dc: <http://purl.org/dc/elements/1.1/>
+PREFIX nfdicore: <https://nfdi.fiz-karlsruhe.de/ontology/>
+PREFIX iconclass: <https://iconclass.org/>
+PREFIX cto: <https://nfdi4culture.de/ontology#>
+
+SELECT ?resource ?resourceLabel ?dataCatalogue
+WHERE {
+   {
+      SELECT ?resource ?resourceLabel ?dataCatalogue WHERE {
+        ?resource cto:subjectConcept iconclass:31A44411 .
+        ?resource rdfs:label ?resourceLabel .
+        BIND("Corpus Vitrearum / NFDI4Culture" AS ?dataCatalogue) .
+      } LIMIT 2
+   } UNION {
+      SERVICE <https://query.wikidata.org/sparql> {
+         SELECT ?resource ?resourceLabel ?dataCatalogue WHERE {
+  			?resource wdt:P1257 "31A44411" .
+  			BIND("Wikidata" AS ?dataCatalogue) .
+         } LIMIT 2
+      }
+   } UNION {
+      SERVICE <https://api.data.netwerkdigitaalerfgoed.nl/datasets/Rijksmuseum/collection/services/collection/sparql> {
+         SELECT ?resource ?resourceLabel ?dataCatalogue WHERE {
+  			?resource dc:subject <http://iconclass.org/31A44411> .
+  			?resource dc:title ?resourceLabel .
+  			BIND("Rijksmuseum Amsterdam" AS ?dataCatalogue) .
+         } LIMIT 2
+      }
+   }
+}
+```
+
+## Classes
+
+```shmarql
+SELECT DISTINCT ?uri (COUNT(?x) as ?c) ?label WHERE {
+                        ?x a ?uri
+                        OPTIONAL{
+        {
+            ?uri <http://www.w3.org/2000/01/rdf-schema#label> ?label
+        }
+    }
+                    } GROUP BY ?uri ?label ORDER BY DESC(?c)
+```