Add initial match config

docs/configuration.md

@@ -26,7 +26,7 @@ After installing espanso, the `.espanso` directory will contain the following fi
 The `default.yml` file contains the **main configurations** and for a basic usage, this is the only file
 you will be working with. 
 
-The `user` folder is used to store advanced configurations, such as [Application-specific](#application-specific-config) configs.
+The `user` folder is used to store more advanced user configurations, such as [Application-specific](#application-specific-config) configs.
 
 The `packages` folder stores packages installed using the *package manager* and should not be directly modified
 by the user. For more information, check out the [Packages](/docs/packages) section of the documentation.

docs/matches.md

@@ -2,6 +2,68 @@
 title: Matches
 layout: docs
 ---
-This section will cover the basics of espanso packages and will show you how to create one.
+Matches are the espanso's core component and define the substitutions that will take place.
 
-TODO
+### Static Matches
+
+In their most basic form, **Matches are pairs that associate a *trigger* with a *replaced text***.
+
+For example, we can define a match that will expand every occurrence of `hello` with `world` while we are typing. Using the [YAML](https://en.wikipedia.org/wiki/YAML) syntax, it can be expressed as:
+
+```
+- trigger: "hello"
+  replace: "world"
+```
+
+To replace the original text with a *multi-line* expansion, we can use the `\n` line terminator character, such as:
+
+```
+- trigger: "hello"
+  replace: "line1\nline2"
+```
+
+These kind of expansions are simple text replacements and are *static*.
+
+### Dynamic Matches
+
+Static matches are suitable for many tasks, but can be problematic when we need an **expansion that changes dynamically**. For those situations, espanso introduces the concepts of **variables** and **extensions**.
+
+**Variables** can be used in the **replace** clause of a Match to include the *output* of a dynamic component, the **extension**. To make things more clear, let's see an example:
+
+We want to create a match that, everytime we type `:now`, it expands it to include the current time, like:
+
+```
+It's 11:29
+```
+
+Let's add the following match to a configuration file, such as the `default.yml` config.
+
+{% raw %}
+```
+- trigger: ":now"
+  replace: "It's {{mytime}}"
+  vars:
+    - name: mytime
+      type: date
+      params:
+        format: "%H:%M"
+```
+{% endraw %}
+
+And restart espanso with:
+
+```
+espanso restart
+```
+
+At this point, everytime we type `:now`, we should see something like: `It's 09:33`!
+
+Let's analyze the match step by step:
+
+TODO
+
+### Script Extension
+
+### Shell Extension
+
+### Date Extension