feat: 添加gitignore以及模板生成示例代码

.gitignore

+### Java ###
+HELP.md
+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Python ###
+/.settings/
+/bin/
+__pycache__/
+/venv/
+
+### filter databfile、sln file ###
+*.mdb
+*.ldb
+*.sln
+
+### class file ###
+*.pyc
+*.com
+*.class
+*.dll
+*.exe
+*.o
+*.so
+
+### compression file ###
+*.7z
+*.dmg
+*.gz
+*.iso
+*.jar
+*.rar
+*.tar
+*.zip
+*.via
+*.tmp
+*.err
+*.log
+*.ini
+*.jpg
+*.png
+*.ico
+### OS generated files ###
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+Icon?
+ehthumbs.db
+Thumbs.db
+/.mvn/
+/mvnw.cmd
+/mvnw

src/case.py

+# 示例文件
+# 来自CSDN博客
+# OJ平台代码模板自动生成
+# https://blog.csdn.net/qq_44193969/article/details/126290082
+
+def is_float_num(str):
+    s = str.split('.')
+    if len(s) > 2:
+        return False
+    else:
+        for si in s:
+            if not si.isdigit():
+                return False
+        return True
+
+
+def is_number(i):
+    try:
+        int(i)
+        return True
+    except:
+        return False
+
+
+def parse_input_one(item, var_name, input_var_idx=0, assgin_var_type=None):
+    var_type = None
+    var_def = None
+    var_input = None
+
+    if assgin_var_type is not None:
+        var_type = assgin_var_type
+        var_def_ = f"{assgin_var_type} {var_name} = str_{input_var_idx}"
+    else:
+        if is_number(item):
+            var_type = "int"
+            var_def_ = f"int {var_name} = Integer.parseInt(str_{input_var_idx})"
+        elif is_float_num(item):
+            var_type = "float"
+            var_def_ = f"float {var_name} = Float.parseFloat(str_{input_var_idx})"
+        else:
+            var_type = "String"
+            var_def_ = f"String {var_name} = str_{input_var_idx}"
+
+    var_def = f"{var_type} {var_name}"
+    input_template = f"String str_{input_var_idx} = scan.nextLine().trim();"
+    var_input = f"{input_template}\n\t\t{var_def_}"
+    return var_type, var_name, var_def, var_input