move day1 to new dir

diff --git a/build.zig b/day1/build.zig
similarity index 100%
rename from build.zig
rename to day1/build.zig

diff --git a/build.zig.zon b/day1/build.zig.zon
similarity index 100%
rename from build.zig.zon
rename to day1/build.zig.zon

diff --git a/day1.txt b/day1/day1.txt
similarity index 100%
rename from day1.txt
rename to day1/day1.txt

diff --git a/day1_test.txt b/day1/day1_test.txt
similarity index 100%
rename from day1_test.txt
rename to day1/day1_test.txt

diff --git a/day1_test2.txt b/day1/day1_test2.txt
similarity index 100%
rename from day1_test2.txt
rename to day1/day1_test2.txt

diff --git a/src/main.zig b/day1/src/main.zig
similarity index 100%
rename from src/main.zig
rename to day1/src/main.zig

diff --git a/src/root.zig b/day1/src/root.zig
similarity index 100%
rename from src/root.zig
rename to day1/src/root.zig