Add a readme to the release

photomode/readme.txt

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+# Half-Life Photo Mode
+
+A basic photo mode for Half-Life.
+
+Releases: https://github.com/laurirasanen/halflife-photomode/releases
+
+## Install
+
+Move this folder to the root directory of your Half-Life install.
+
+So you end up with a structure like:
+
+Half-Life
+  photomode
+    cl_dlls
+    dlls
+  valve
+  valve_hd
+
+Then add '-game photomode' to your game launch settings.
+
+## Settings
+
+See keyboard tab in settings for controls.
+
+Default:
+  TAB: photomode
+  ARROW KEYS: move horizontally
+  PG UP/PG DOWN: move vertically
+
+Alternatively bind keys to:
+  photomode
+  +cam_pm_forward
+  +cam_pm_back
+  +cam_pm_right
+  +cam_pm_left
+  +cam_pm_up
+  +cam_pm_down
+
+## Known Issues
+
+### No raw input
+
+You should enable raw input under mouse settings.
+Otherwise while in photo mode, the mouse will "collide" with edges of the window,
+and not let you turn any further.
+Gordon will also snap to the angle you are looking when exiting photo mode.
+
+### Unpausing during photo mode
+
+Photo mode toggles pause when entering and exiting.
+If you toggle pause via any other means while in photo mode,
+it will still be toggled again when exiting.
+e.g. hitting ESC to open and close the menu while in photo mode
+will result in the game being unpaused while in photo mode,
+and then paused again when exiting. Hit escape again afterwards to resolve.
+