Add GitHub CI (#17)

* Move code to src/ directory
* Add basic GitHub CI

Author: mqudsi

.github/workflows/ci.yaml

@@ -0,0 +1,38 @@
+name: CppSQLite CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build-and-test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        # os: [ubuntu-latest, windows-latest, macos-latest]
+        os: [ubuntu-latest, macos-latest]
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Build static library (CppSQLite3.o/CppSQLite3.obj)
+      run: |
+        c++ -std=c++11 -c src/CppSQLite3.cpp -o CppSQLite3.o
+
+    - name: Build and run test program
+      if: runner.os != 'Windows'
+      run: |
+        c++ -std=c++11 src/test.cpp src/CppSQLite3.cpp -lsqlite3 -o testprog
+        ./testprog
+      shell: bash
+
+    # Windows expects .exe and uses different shell
+    - name: Build and run test program
+      if: runner.os == 'Windows'
+      run: |
+        cl /EHsc /MD src/test.cpp src/CppSQLite3.cpp /I. /link sqlite3.lib
+        testprog.exe
+      shell: cmd

CppSQLite3.cpp renamed to src/CppSQLite3.cpp

@@ -0,0 +1,48 @@
+#include "CppSQLite3.h"
+#include <iostream>
+#include <cassert>
+
+int main() {
+    try {
+        CppSQLite3DB db;
+
+        // In-memory database
+        db.open(":memory:");
+
+        db.execDML("CREATE TABLE test(id INTEGER PRIMARY KEY, name TEXT);");
+        assert(db.tableExists("test"));
+
+        db.execDML("INSERT INTO test(name) VALUES ('Alice');");
+        db.execDML("INSERT INTO test(name) VALUES ('Bob');");
+
+        // Query it back using both Query and Table
+        {
+            auto q = db.execQuery("SELECT * FROM test ORDER BY id;");
+            int cnt = 0;
+            while (!q.eof()) {
+                int id = q.getIntField("id");
+                const char* name = q.getStringField("name");
+                std::cout << "Row " << id << ": " << name << std::endl;
+                q.nextRow();
+                ++cnt;
+            }
+            assert(cnt == 2);
+        }
+
+        {
+            auto t = db.getTable("SELECT id, name FROM test;");
+            assert(t.numRows() == 2);
+            t.setRow(0);
+            assert(std::string(t.getStringField(1)) == "Alice");
+            t.setRow(1);
+            assert(std::string(t.getStringField(1)) == "Bob");
+        }
+
+        db.close();
+        std::cout << "CppSQLite basic tests passed!" << std::endl;
+        return 0;
+    } catch(const CppSQLite3Exception& e) {
+        std::cerr << "CppSQLite3Exception: " << e.errorMessage() << std::endl;
+        return 1;
+    }
+}