Add system repository for command line handling

system_repository.py

@@ -0,0 +1,22 @@
+import subprocess as sub
+
+class SystemRepository():
+
+    def __init__(self):
+        self.stdout = [""]
+        self.stderr = [""]
+    
+    def run(self, *args):
+        stream = sub.Popen(args,
+                           stdout=sub.PIPE,
+                           stderr=sub.PIPE,
+                           text=True,
+                           encoding="UTF-8")
+        self.stdout = stream.stdout.readlines()
+        self.stderr = stream.stderr.readlines()
+
+    def run_checked(self, *args):
+        self.run(args)
+
+        if len(self.stderr) > 0:
+            raise Exception(f"Command failed with: {self.stderr}")