Add espanso configuration

Signed-off-by: Severin Kaderli <severin@kaderli.dev>

system/.config/espanso/default.yml

@@ -0,0 +1,21 @@
+# espanso configuration file
+
+# This is the default configuration file, change it as you like it
+# You can refer to the official documentation:
+# https://espanso.org/docs/
+
+# Matches are the substitution rules, when you type the "trigger" string
+# it gets replaced by the "replace" string.
+matches:
+  # Simple text replacement
+  - trigger: ":mail"
+    replace: "severin@kaderli.dev"
+
+  - trigger: ":date"
+    replace: "{{date}}"
+    vars:
+      - name: date
+        type: date
+        params: 
+          format: "%F"
+...