doc: Add README

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+# APKDOC
+
+Document generator for alpine's index format v2 file[^1].
+
+## Usage example
+
+```sh
+apkdoc \
+	-t text \
+	-u https://alpine.mirror.wearetriple.com/v3.18/main/x86_64/APKINDEX.tar.gz \
+	-f example.md \
+	-o index.txt
+```
+
+## Data 
+
+`apkdoc` offers a list of the following struct to the template:
+
+```go
+type Entry struct {
+	Checksum         string     // C
+	Version          string     // V
+	Name             string     // P
+	Architecture     *string    // A
+	PackageSize      int        // S
+	InstalledSize    int        // I
+	Description      string     // T
+	Url              string     // U
+	License          string     // L
+	Origin           *string    // o
+	Maintainer       *string    // m
+	BuildTime        *time.Time // t
+	Commit           *string    // c
+	ProviderPriority *int       // k
+	Dependencies     []string   // D
+	Provides         []string   // p
+	InstallIf        []string   // i
+}
+```
+
+## Functions
+
+`apkdoc` also offers a couple help functions.
+
+### `DerefI`
+
+Deref int pointer.
+
+### `DerefS`
+
+Deref string pointer.
+
+### `Properties`
+
+A `Entry` function that generate a map of with lower cased space separated
+property name.
+
+[^1]: https://wiki.alpinelinux.org/wiki/Apk_spec
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