feat: ✨ Added Sqlite reader

pkg/readers/sqlite/README.md

@@ -0,0 +1,75 @@
+# SQLite Reader
+
+Reads database schema from SQLite database files.
+
+## Usage
+
+```go
+import (
+    "git.warky.dev/wdevs/relspecgo/pkg/readers"
+    "git.warky.dev/wdevs/relspecgo/pkg/readers/sqlite"
+)
+
+// Using file path
+options := &readers.ReaderOptions{
+    FilePath: "path/to/database.db",
+}
+
+reader := sqlite.NewReader(options)
+db, err := reader.ReadDatabase()
+
+// Or using connection string
+options := &readers.ReaderOptions{
+    ConnectionString: "path/to/database.db",
+}
+```
+
+## Features
+
+- Reads tables with columns and data types
+- Reads views with definitions
+- Reads primary keys
+- Reads foreign keys with CASCADE actions
+- Reads indexes (non-auto-generated)
+- Maps SQLite types to canonical types
+- Derives relationships from foreign keys
+
+## SQLite Specifics
+
+- SQLite doesn't support schemas, creates single "main" schema
+- Uses pure Go driver (modernc.org/sqlite) - no CGo required
+- Supports both file path and connection string
+- Auto-increment detection for INTEGER PRIMARY KEY columns
+- Foreign keys require `PRAGMA foreign_keys = ON` to be set
+
+## Example Schema
+
+```sql
+PRAGMA foreign_keys = ON;
+
+CREATE TABLE users (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    username VARCHAR(50) NOT NULL UNIQUE,
+    email VARCHAR(100) NOT NULL
+);
+
+CREATE TABLE posts (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    user_id INTEGER NOT NULL,
+    title VARCHAR(200) NOT NULL,
+    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
+);
+```
+
+## Type Mappings
+
+| SQLite Type | Canonical Type |
+|-------------|---------------|
+| INTEGER, INT | int |
+| BIGINT | int64 |
+| REAL, DOUBLE | float64 |
+| TEXT, VARCHAR | string |
+| BLOB | bytea |
+| BOOLEAN | bool |
+| DATE | date |
+| DATETIME, TIMESTAMP | timestamp |