diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
new file mode 100644
index 0000000..d89e6d7
--- /dev/null
+++ b/.gitea/workflows/ci.yml
@@ -0,0 +1,23 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: install deps
+        run: sudo apt install cmake
+
+      - name: build
+        run: |
+          cmake -B build
+          cmake --build build
+
+      - name: test
+        run: |
+          cd build
+          ctest
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..58f442b
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,27 @@
+cmake_minimum_required(VERSION 4.1)
+project(curtle VERSION 0.1.0 LANGUAGES C)
+
+add_library(curtle
+        src/linear_algebra.c
+)
+
+target_include_directories(curtle
+        PUBLIC
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:include>
+)
+
+install(TARGETS curtle
+        EXPORT curtleTargets
+        LIBRARY DESTINATION lib
+        ARCHIVE DESTINATION lib
+)
+
+install(DIRECTORY include/ DESTINATION include)
+
+enable_testing()
+
+add_executable(test_linear_algebra tests/test_linear_algebra.c)
+target_link_libraries(test_linear_algebra curtle)
+
+add_test(NAME linear_algebra_test COMMAND test_linear_algebra)
\ No newline at end of file
diff --git a/include/curtle/curtle.h b/include/curtle/curtle.h
new file mode 100644
index 0000000..e69de29
diff --git a/include/curtle/linear_algebra.h b/include/curtle/linear_algebra.h
new file mode 100644
index 0000000..0c33aad
--- /dev/null
+++ b/include/curtle/linear_algebra.h
@@ -0,0 +1,11 @@
+#ifndef CURTLE_VECTOR_H
+#define CURTLE_VECTOR_H
+
+typedef struct {
+    double x;
+    double y;
+} vec2;
+
+vec2 vec2_add(vec2 a, vec2 b);
+
+#endif
\ No newline at end of file
diff --git a/src/linear_algebra.c b/src/linear_algebra.c
new file mode 100644
index 0000000..8afa077
--- /dev/null
+++ b/src/linear_algebra.c
@@ -0,0 +1,5 @@
+#include "curtle/linear_algebra.h"
+
+vec2 vec2_add(vec2 a, vec2 b) {
+    return (vec2){a.x + b.x, a.y + b.y};
+}
\ No newline at end of file
diff --git a/tests/test_linear_algebra.c b/tests/test_linear_algebra.c
new file mode 100644
index 0000000..3e6ba3e
--- /dev/null
+++ b/tests/test_linear_algebra.c
@@ -0,0 +1,12 @@
+#include <assert.h>
+#include "curtle/linear_algebra.h"
+
+int main() {
+    vec2 a = {1,2};
+    vec2 b = {3,4};
+
+    vec2 r = vec2_add(a,b);
+
+    assert(r.x == 4);
+    assert(r.y == 6);
+}
\ No newline at end of file