Added split string operator

pkg/yqlib/doc/String Operators.md

@@ -1,3 +1,4 @@
+# String Operators
 
 ## Join strings
 Given a sample.yml file of:
@@ -17,3 +18,35 @@ will output
 cat; meow; 1; ; true
 ```
 
+## Split strings
+Given a sample.yml file of:
+```yaml
+cat; meow; 1; ; true
+```
+then
+```bash
+yq eval 'split("; ")' sample.yml
+```
+will output
+```yaml
+- cat
+- meow
+- "1"
+- ""
+- "true"
+```
+
+## Split strings one match
+Given a sample.yml file of:
+```yaml
+word
+```
+then
+```bash
+yq eval 'split("; ")' sample.yml
+```
+will output
+```yaml
+- word
+```
+

pkg/yqlib/doc/headers/String Operators.md

@@ -0,0 +1 @@
+# String Operators