README.md: configure section added

README.md

@@ -186,6 +186,21 @@ Run time options for [nlines](https://github.com/fstab50/nlines) can be configur
 
 [![help](./assets/configure_1.png)](http://d1qxyi0fawulzu.cloudfront.net/nlines/configure_1.png)
 
+* **Option A**:  To add a new file type to exclude from line counting, select option "a":
+
+[![help](./assets/configure_2.png)](http://d1qxyi0fawulzu.cloudfront.net/nlines/configure_2.png)
+
+[![help](./assets/configure_3.png)](http://d1qxyi0fawulzu.cloudfront.net/nlines/configure_4.png)
+
+* **Option B**: To remove a file type from the exclusion list so that files of this type are _included in line counts_, select option "B":
+
+[![help](./assets/configure_4.png)](http://d1qxyi0fawulzu.cloudfront.net/nlines/configure_4.png)
+
+* **Option C**: To change the threshold at which file objects are highlighted to indicate large line count, select option "c":
+
+[![help](./assets/configure_5.png)](http://d1qxyi0fawulzu.cloudfront.net/nlines/configure_5.png)
+
+
 
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