added requirements

requirements.txt

@@ -0,0 +1,18 @@
+aiohttp==3.5.4
+async-timeout==3.0.1
+attrs==19.1.0
+chardet==3.0.4
+html5lib==1.0.1
+idna==2.8
+idna-ssl==1.1.0
+Jinja2==2.10
+makeserver3==3.0.0
+Markdown==3.0.1
+MarkupSafe==1.1.1
+multidict==4.5.2
+pkg-resources==0.0.0
+six==1.12.0
+typing-extensions==3.7.2
+webencodings==0.5.1
+yarl==1.3.0
+