install-tl: add page (#7434)

pages/common/install-tl.md

@@ -0,0 +1,28 @@
+# install-tl
+
+> TeX Live cross-platform installer.
+> More information: <https://tug.org/texlive/>.
+
+- Start the text-based installer (default on Unix systems):
+
+`install-tl -no-gui`
+
+- Start the GUI installer (default on macOS and Windows, requires Tcl/Tk):
+
+`install-tl -gui`
+
+- Install TeX Live as defined in a specific profile file:
+
+`install-tl -profile {{path/to/texlive.profile}}`
+
+- Start the installer with the settings from a specific profile file:
+
+`install-tl -init-from-file {{path/to/texlive.profile}}`
+
+- Start the installer for installation on a portable device, like a USB stick:
+
+`install-tl -portable`
+
+- Show help for `install-tl`:
+
+`install-tl -help`