Add django rest framework and basic plant model

- Adds django rest framework to requirements
- Adds basic plant model with id and name fields
- Adds CRUD endpoints to interact with plant objects

backend/right_tree/api/admin.py

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+from django.contrib import admin
+
+# Register your models here.

backend/right_tree/api/apps.py

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+from django.apps import AppConfig
+
+
+class ApiConfig(AppConfig):
+    name = 'right_tree.api'

backend/right_tree/api/migrations/0001_initial.py

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+# Generated by Django 3.2.8 on 2021-10-06 18:32
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='Plant',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.TextField()),
+            ],
+        ),
+    ]

backend/right_tree/api/models.py

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+from django.db import models
+
+class Plant(models.Model):
+    name = models.TextField()

backend/right_tree/api/serializers.py

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+from rest_framework import serializers
+from right_tree.api.models import Plant
+
+class PlantSerializer(serializers.HyperlinkedModelSerializer):
+    id = serializers.ReadOnlyField()
+
+    class Meta:
+        model = Plant
+        fields = ['id', 'name']

backend/right_tree/api/views.py

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+from rest_framework import viewsets
+from right_tree.api.models import Plant
+from right_tree.api.serializers import PlantSerializer
+
+class PlantViewSet(viewsets.ModelViewSet):
+    """
+    API endpoint that allows hours to be grouped or edited.
+    """
+    queryset = Plant.objects.all()
+    serializer_class = PlantSerializer