Created Extensions (markdown)

Extensions.md

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+# Extensions
+currently available only `progressbar`
+
+you can new issues for request new extensions
+
+# progressbar
+This extensions for show your progree
+
+## indeterminateStatus
+```py
+loading = indeterminateStatus(client)
+loading.start()
+time.sleep(5)
+loading.stop()
+```
+## LoadingProgress
+```py
+l = LoadingProgress(client, total=100, color=True)
+l.start()
+for i in range(101):
+    l.current = i
+    l.desc = "loading..."
+    time.sleep(0.05)
+l.stop()
+```