Create a plan for implementing projects and also create the backend API. (#19)

Creates projects to organize tasks under. (Note the migration also contains the tables for creating folders for projects as well because adding foreign keys is a PITA in sqlite apparently).

Reviewed-on: #19
Co-authored-by: Drew Galbraith <drew@tiramisu.one>
Co-committed-by: Drew Galbraith <drew@tiramisu.one>

backend/.sqlx/query-3fbe5a29facacd03360f017a3ab078c9ae067aafcaa2e7ca29d597c0a74ac48d.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "UPDATE projects \n            SET title=$1, color=$2, folder_id=$3, status=$4, sort_order=$5, updated_at=$6, completed_at=$7 \n            WHERE id=$8",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 8
+    },
+    "nullable": []
+  },
+  "hash": "3fbe5a29facacd03360f017a3ab078c9ae067aafcaa2e7ca29d597c0a74ac48d"
+}