move scripts and update CHANGELOG

Author: isaisabel

CHANGELOG.md

@@ -1,4 +1,11 @@
 # Changes staged on develop
+## New Scripts
+Added scripts used to generate the [sample layers in the ATT&CK Navigator repository](https://github.com/mitre-attack/attack-navigator/tree/develop/layers/data/samples). See issue [#21](https://github.com/mitre-attack/attack-scripts/issues/21) and [the sample layer README](scripts/layers/samples/README.md) for more details. The following scripts were added:
+- [heatmap.py](scripts/layers/samples/heatmap.py)
+- [bear_APT.py](scripts/layers/samples/bear_APT.py)
+- [apt3_apt29_software.py](scripts/layers/samples/apt3_apt29_software.py)
+- [software_execution.py](scripts/layers/samples/software_execution.py)
+
 ## Improvements
 - Updated [diff_stix.py](scripts/diff_stix.py) with sub-techniques support. See issue [#12](https://github.com/mitre-attack/attack-scripts/issues/12).
 

layers/samples/README.md scripts/layers/samples/README.mdlayers/samples/README.md renamed to scripts/layers/samples/README.md

@@ -1,6 +1,6 @@
 # Sample Scripts
 
-The scripts in this folder are used to generate the [sample layers in the ATT&CK Navigator repository](https://github.com/mitre-attack/attack-navigator/tree/master/layers/data/samples). Run the scripts with the -h flag for usage instructions.
+The scripts in this folder are used to generate the [sample layers in the ATT&CK Navigator repository](https://github.com/mitre-attack/attack-navigator/tree/develop/layers/data/samples). Run the scripts with the -h flag for usage instructions.
 
 | script | sample layers | description |
 |:-------|:------------|:--------|