chore: add readme

README.md

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+# Vala + GTK4 Template
+
+This is a simple template for creating GTK4 applications using Vala, LibAdwaita
+and Blueprint.
+
+## Usage
+
+Edit the file `setup-template.sh` to include your name, project name and
+project id. Then, run the script. This will rename everything within the
+template to your desired values.
+
+## Building, Running and Installing
+
+Set up the project build folder (only required once):
+
+```sh
+$ meson setup build
+```
+
+Build the project:
+
+```sh
+$ ninja -C build
+```
+
+Run the program:
+
+```sh
+$ build/src/$PROJECT_NAME
+```
+
+Install the program and resources:
+
+```sh
+$ sudo ninja -C build install
+```