Added all Exercises

src/assets/A1.html

src/assets/A2.html

src/assets/A3.html

src/assets/A4.html

src/assets/A5.html

src/assets/A6.html

src/assets/frames/A12/U12.1.html

src/assets/frames/A12/U12.2.html

src/assets/frames/A8/U8.1.html

src/assets/frames/A8/U8.2.html

src/assets/frames/A8/U8.3.html

src/assets/frames/A9/U9.1.html

src/assets/frames/A9/U9.2.html

src/assets/frames/A9/U9.3.html

src/components/Home.vue

src/components/Sub/U11_1.vue

src/components/Sub/U11_2_h.vue

src/components/Sub/U11_2_v.vue

src/components/U10.vue

src/components/U11.vue