Updated .github/ template files to allow issue and PR templates.

.github/ISSUE_TEMPLATE.md

@@ -1,4 +1,18 @@
-<!-- 
-  I'm not very good at English. So, I'm glad if you write in English as easy as possible.
-  日本語がわかる方はなるべく日本語でお願いします。
--->
+<Please fill your information below the lines starting with `#`.>
+<You can delete these lines enclosed by `<` and `>` before posting, too.>
+
+# Description of the issue
+<What is the issue/problem you are facing?>
+
+# What was expected to be seen
+<What were you expecting to see?>
+
+# What actually was seen instead
+<What did you actually see? Try to be precise as possible!>
+
+# Environment
+Browser: <Version of your browser.>
+Build environment (i.e. NodeJS): <If you have issues building the SCSS into CSS, add your information here. Delete this otherwise.>
+
+# Suggestion(s) for fixing this issue
+<What are your thoughts? How could this possibly be resolved?>

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,4 +1,11 @@
-<!-- 
-  I'm not very good at English. So, I'm glad if you write in English as easy as possible.
-  日本語がわかる方はなるべく日本語でお願いします。
--->
+<Please fill your information below the lines starting with `#`.>
+<You can delete these lines enclosed by `<` and `>` before posting, too.>
+
+# Description
+<What does this PR do, what does it want to achieve?>
+
+# Compatibility
+<Elaborate on how this PR affects the compatibility. Is it breaking, or not?>
+
+# Caveats
+<Is there something specific you'd like to mention before merge?>