i3: add common page (#4960)

pages/linux/i3.md

@@ -0,0 +1,32 @@
+# i3
+
+> A dynamic tiling window manager.
+> More information:<https://i3wm.org/docs/userguide.html>.
+
+- Start i3 (Note that a pre-existing window manager must not be open when this command is run.):
+
+`i3`
+
+- Open a new terminal window:
+
+`Super + Return`
+
+- Create a new workspace:
+
+`Super + Shift + {{number}}`
+
+- Switch to workspace {{number}}:
+
+`Super + {{number}}`
+
+- Open new window horizontally:
+
+`Super + h`
+
+- Open new window vertically:
+
+`Super + v`
+
+- Open application (type out application name after executing command):
+
+`Super + D`