feat: add section aliases (#14)

Just like you can use multiple sections, the INI sections themselves can have multiple aliases. For example, you can have the same section under two or more names to avoid duplication:

```ini
; you can use these environment variables by using name "user" or "personal"
[user, personal]
NAME=...
ID=...
```

.as-a.ini

@@ -1,7 +1,15 @@
-; example .as-a.ini file used for testing
-[testing]
+; example .as-a.ini file used for demonstration purposes
+[demo]
 MY_VARIABLE=42
 
 ; same section name as the folder
 [as-a]
 MY_VARIABLE=42
+
+; the same section that can be loaded using three names
+[name-one, name-two, name-three]
+MY_VARIABLE=80
+
+; section name with empty aliases
+[alias1,, , alias2]
+MY_VARIABLE=100

.github/workflows/ci.yml

@@ -16,6 +16,12 @@ jobs:
       - name: Test 🧪
         run: npm test
 
+      - name: Demo 🎬
+        run: npm run demo
+
+      - name: Demo dot 🎬
+        run: npm run demo:dot
+
       - name: Semantic Release 🚀
         uses: cycjimmy/semantic-release-action@v2
         env:

README.md

@@ -104,6 +104,24 @@ Resolution
 - otherwise an error is thrown
 
 
+## Section aliases
+
+Just like you can use multiple sections, the INI sections themselves can have multiple aliases. For example, you can have the same section under two or more names to avoid duplication:
+
+```ini
+; you can use these environment variables by using name "user" or "personal"
+[user, personal]
+NAME=...
+ID=...
+```
+
+These two commands are equivalent
+
+```shell
+$ as-a user ...
+$ as-a personal ...
+```
+
 ## Version
 
 To see the version of the installed `as-a` run it without arguments