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/migrations/0001_initial.py

@@ -0,0 +1,21 @@
+# 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()),
+            ],
+        ),
+    ]