Add tutorial 1 slides

Author: htyao

.github/workflows/remove_solution.yml

@@ -18,7 +18,7 @@ env:
   FILE1_POST: 1_ViennaRNA_Introduction_No_Solution.ipynb
   FILE2_PRE: 2_Practical_Example.ipynb
   FILE2_POST: 2_Practical_Example_No_Solution.ipynb
-  OTHER_FILES: README.md 2_input .github/workflows .gitignore viennarna-tutorial.yml
+  OTHER_FILES: README.md 2_input .github/workflows .gitignore viennarna-tutorial.yml Slides/tutorial1_Seq_to_2D_practical.pdf
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs: