added Tag class, repo, service and controller, tested and confirmed w…

src/main/java/com/example/demo/Tag.java

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+package com.example.demo;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+@Entity
+public class Tag {
+    @Id
+    @GeneratedValue
+    Long id;
+    String name;
+
+    public Tag() {
+    }
+
+    public Tag(Long id, String name) {
+        this.id = id;
+        this.name = name;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
+
+
+

src/main/java/com/example/demo/TagController.java

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+package com.example.demo;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/tagController")
+public class TagController {
+
+    @Autowired
+    private TagService service;
+
+    @GetMapping(value = "/read/{id}")
+    public ResponseEntity<Tag> read(@PathVariable Long id){
+        return new ResponseEntity<>(service.read(id), HttpStatus.OK);
+    }
+
+    @GetMapping(value = "/read")
+    public ResponseEntity<List<Tag>> readAll(){
+        return new ResponseEntity<>(service.readAll(), HttpStatus.OK);
+    }
+
+    @PostMapping(value = "/create")
+    public ResponseEntity<Tag> create(@RequestBody Tag tag){
+        return new ResponseEntity<>(service.create(tag), HttpStatus.CREATED);
+    }
+
+    @PutMapping(value = "/update/{id}")
+    public ResponseEntity<Tag> update(@PathVariable Long id, @RequestBody Tag tag){
+        return new ResponseEntity<>(service.update(id, tag), HttpStatus.OK);
+    }
+
+    @DeleteMapping(value = "/delete/{id}")
+    public ResponseEntity<Tag> delete(@PathVariable Long id){
+        return new ResponseEntity<>(service.delete(id), HttpStatus.OK);
+    }
+}

src/main/java/com/example/demo/TagRepository.java

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+package com.example.demo;
+
+import org.springframework.data.repository.CrudRepository;
+
+public interface TagRepository extends CrudRepository<Tag, Long> {
+}

src/main/java/com/example/demo/TagService.java

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+package com.example.demo;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.ArrayList;
+import java.util.List;
+
+@Service
+public class TagService {
+    @Autowired
+    private TagRepository repository;
+
+    public Tag create(Tag tag){ return repository.save(tag); }
+
+    public Tag read(Long id){ return repository.findById(id).get(); }
+
+    public List<Tag> readAll(){
+        Iterable<Tag> tagIterable = repository.findAll();
+        List<Tag> result = new ArrayList<>();
+        tagIterable.forEach(result::add);
+        return result;
+    }
+
+    public Tag update(Long id, Tag newTag){
+        Tag tagInDatabase = read(id);
+        tagInDatabase.setName(newTag.getName());
+        return repository.save(tagInDatabase);
+    }
+
+    public Tag delete(Tag tag){
+        repository.delete(tag);
+        return tag;
+    }
+
+    public Tag delete(Long id){
+        return delete(read(id));
+    }
+}