docs(readme): default imports

Author: kawre

README.md

@@ -239,8 +239,18 @@ logging = true
 
 Inject code before or after your solution, injected code won't be submitted or run.
 
+#### default imports
+
+You can also pass `before = true` to inject default imports for the language.
+Supported languages are `python`, `python3`, `java`
+
+Access default imports via `require("leetcode.config.imports)`
+
 ```lua
 injector = { ---@type table<lc.lang, lc.inject>
+    ["python3"] = {
+        before = true
+    },
     ["cpp"] = {
         before = { "#include <bits/stdc++.h>", "using namespace std;" },
         after = "int main() {}",

README.zh.md

@@ -241,6 +241,13 @@ logging = true
 
 在你的答案前后注入额外代码，注入的代码不会被提交或测试。
 
+#### 默认导入
+
+您还可以传递 `before = true` 以注入语言的默认导入。
+支持的语言为 `python`、`python3`、`java`
+
+通过 `require("leetcode.config.imports)` 访问默认导入
+
 ```lua
 injector = { ---@type table<lc.lang, lc.inject>
     ["cpp"] = {
@@ -316,6 +323,8 @@ image_support = false, -- 将此设置为 `true` 将禁用问题描述的换行
 
 - `restore` 尝试恢复默认问题布局
 
+- `inject` 重新注入当前问题的代码
+
 - `session`
 
   - `create` 创建一个新的会话