started writing lexer after making string lib

string/docs/check/starts_with.md

@@ -0,0 +1,25 @@
+# string_StartsWith
+Check if a string is prefixed by another string.
+
+## Arguments
+- str (string): the string to check against.
+- prefix (string): the prefix to check for.
+
+## Returns
+hasPrefix (bool): returns `true` if `str` is prefixed by the given `prefix`, otherwise `false`.
+
+## Example
+### Ground
+```python
+call !string_StartsWith "doc_someFile.txt" "doc_" &hasPrefix
+println $hasPrefix # true
+
+call !string_StartsWith "someFile.txt" "doc_" &hasPrefix
+println $hasPrefix # false
+```
+
+### Solstice
+```c
+puts string_StartsWith("doc_someFile.txt", "doc_") // true
+puts string_StartsWith("someFile.txt", "doc_") // false
+```