First pass at creating requirements files.

requirements.txt

@@ -0,0 +1,7 @@
+pygame>=2.0.0
+pyperclip>=1.8.0
+requests>=2.25.0
+pyxdg>=0.27
+setproctitle>=1.2.0
+numpy>=1.19.0
+accessible-output2>=0.14

requirements_linux.txt

@@ -0,0 +1,2 @@
+-r requirements.txt
+python-speechd>=0.11.1