move pttodo-cli up from /cmd/

cmd/testdata/1.yaml

@@ -0,0 +1,4 @@
+todo:
+- "1"
+scheduled: []
+done: []

cmd/testdata/2.yaml

@@ -0,0 +1,4 @@
+todo:
+- "2"
+scheduled: []
+done: []

cmd/testdata/3.yaml

@@ -0,0 +1,4 @@
+todo:
+- "3"
+scheduled: []
+done: []

cmd/testdata/root.yaml

@@ -0,0 +1,4 @@
+todo:
+- root
+scheduled: []
+done: []

cmd/testdata/test.yaml

@@ -0,0 +1,10 @@
+todo:
+- hi20890
+- hi
+- b
+- todo: loop
+  schedule: 10s
+- todo: past
+  schedule: "2000-01-02"
+scheduled: []
+done: []