added readme

readme.md

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+# lim
+
+this is a simple cli to limit a stream of bytes by a certain number.
+
+
+## installation
+
+use `go get` to install:
+
+    go get mcquay.me/lim
+
+
+## example usage
+
+if you install the trash utility:
+
+    go install mcquay.me/trash
+
+then pipe its output:
+
+```bash
+$ trash | lim > trash.dat
+$ ls -lah trash.dat
+-rw-r--r--  1 sm  staff   1.0M Aug 22 18:28 trash.dat
+
+$ trash | lim 1gi > trash.dat
+$ ls -lah trash.dat
+-rw-r--r--  1 sm  staff   1.0G Aug 22 18:28 trash.dat
+```