Add picom configuration file

This will allow alacritty to be transparent.

* added: picom/picom.conf
* modified: i3/config

picom/picom.conf

@@ -0,0 +1,53 @@
+# Backend
+backend = "glx";
+
+# GLX backend
+glx-no-stencil = true;
+glx-copy-from-front = false;
+
+# Opacity
+active-opacity = 1;
+inactive-opacity = 1;
+frame-opacity = 1;
+inactive-opacity-override = false;
+
+# Blur
+blur-background = false;
+
+# Fading
+fading = true;
+fade-delta = 4;
+fade-in-step = 0.03;
+fade-out-step = 0.03;
+
+# Other
+mark-wmwin-focused = true;
+mark-ovredir-focused = true;
+detect-rounded-corners = true;
+detect-client-opacity = true;
+refresh-rate = 0;
+vsync = true;
+dbe = false;
+unredir-if-possible = false;
+focus-exclude = [ ];
+detect-transient = true;
+detect-client-leader = true;
+
+# Window type settings
+wintypes:
+{
+    tooltip =
+    {
+        fade = true;
+        shadow = false;
+        opacity = 0.85;
+        focus = true;
+    };
+    fullscreen =
+    {
+        fade = true;
+        shadow = false;
+        opacity = 1;
+        focus = true;
+    };
+};