1) deleted conda build dir 2) added readme for the pip dir

Author: mauvais2

conda/conda_package_list.txt

@@ -0,0 +1,13 @@
+# AMPL Pip Build README
+
+There are three requirement files:
+
+1. clients_requirements.txt
+2. requirements.txt
+3. docker_requirements.txt
+
+`clients_requirements.txt` and `requirements.txt` are used for LLNL LC environment build.
+`requirements.txt` is used for the external developers build.
+`docker_requirements.txt` is used for AMPL docker image build.
+
+Please refer the [README](https://github.com/ATOMScience-org/AMPL#create-pip-env) for more details on the build.