doc added for LINDEX

docs/src/content/docs/commands/LINDEX.md

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+---
+title: LINDEX
+description: The `LINDEX` command in DiceDB is used to find an element present in the list stored at a key. 
+---
+
+# LINDEX
+
+The `LINDEX` command in DiceDB is used to find an element present in the list stored at a key. If the key does not exist or the index specified is out of range of the list then the command will throw an error.
+
+## Command Syntax
+
+```bash
+LINDEX [key] [index]
+```
+
+## Parameters
+
+| Parameter    | Description                                                           |    Type     | Required |
+| ------------ | ----------------------------------------------------------------------------------- | -------- | -------- |
+| KEY          | The key associated with the list for which the element you want to retrieve.        | String      | Yes      |
+| INDEX        | The index or position of the element we want to retrieve in the list. 0-based indexing is used to consider elements from head or start of the list. Negative indexing is used (starts from -1) to consider elements from tail or end of the list.  | Integer       | Yes      |
+
+## Return Values
+
+| Condition                                     | Return Value                                  |
+| --------------------------------------------- | --------------------------------------------- |
+| Command is successful                         | Returns the element present in that index     |
+| Key does not exist                            | error                                         |
+| Syntax or specified constraints are invalid    | error                                         |
+
+## Behaviour
+
+When the `LINDEX` command is executed, it performs the specified subcommand operation -
+
+- Returns element present at the `index` of the list associated with the `key` provided as arguments of the command.
+
+- If the `key` exists but is not associated with the list, an error is returned.
+
+## Errors
+
+- `Non existent key`:
+
+  - Error Message: `ERR could not perform this operation on a key that doesn't exist`
+
+- `Missing Arguments`:
+
+  - Error Message: `ERR wrong number of arguments for 'latency subcommand' command`
+  - If required arguments for a subcommand are missing, DiceDB will return an error.
+
+- `Key not holding a list`
+
+    - Error Message : `WRONGTYPE Operation against a key holding the wrong kind of value`
+
+## Example Usage
+
+### Basic Usage
+
+```
+dicedb> LPUSH k 1
+1
+dicedb> LPUSH k 2
+2
+dicedb> LINDEX k 0
+2
+dicedb> LINDEX k -1
+1
+```
+
+### Index out of range
+
+```
+dicedb> LINDEX k 3
+Error: ERR Index out of range
+```
+
+### Non-Existent Key
+
+```
+dicedb> LINDEX NON-EXISTENT -1
+Error: ERR could not perform this operation on a key that doesn't exist
+```
+
+## Best Practices
+
+- Check Key Type: Before using `LINDEX`, ensure that the key is associated with a list to avoid errors.
+
+- Handle Non-Existent Keys: Be prepared to handle the case where the key does not exist, as `LINDEX` will return `ERROR` in such scenarios.
+
+- Make sure the index is within range of the list.