Check in requirements.txt to simplify installing dependencies

Change-Id: I88db5e8a661fb3ddc72b7d423a878c0143353d3e
diff --git a/README.md b/README.md
index c6ec3db..028a84a 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,10 @@
 	apt-get install python3-pyscard python3-serial python3-cmd2 python3-pip python3-yaml
 	pip3 install pytlv
 
+Alternatively, everything can be installed using pip:
+
+	pip3 install -r requirements.txt
+
 
 Mailing List
 ------------
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..978a3db
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,4 @@
+pyscard
+serial
+pytlv
+cmd2