feat: Implement Update Project Route (SCRUM-11) (!28)

Co-authored-by: Phan Huy Tran <p.tran@neusta.de>
Reviewed-on: #28
Reviewed-by: Jan Gleytenhoover <krisellp9@gmail.com>
Co-authored-by: Phan Huy Tran <ptran@noreply.localhost>
Co-committed-by: Phan Huy Tran <ptran@noreply.localhost>

requests/getProject.http

@@ -1,3 +1,3 @@
-### GET request to example server
-GET http://localhost:8080/projects/2
-Authorization: Bearer {{auth_token}}
+### GET request to example server
+GET http://localhost:8080/projects/1
+Authorization: Bearer {{auth_token}}

requests/updateProject.http

@@ -0,0 +1,15 @@
+### GET request to example server
+PUT http://localhost:8080/projects/1
+Authorization: Bearer {{auth_token}}
+Content-Type: application/json
+
+{
+  "name": "newName",
+  "leading_employee": 2,
+  "employees": [],
+  "contractor": 9,
+  "contractor_name": "New Contractor name",
+  "comment": "new goal of project",
+  "start_date": "01.01.2010",
+  "planned_end_date": "01.01.2021"
+}