Update README.md

README.md

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 # imgcat
+
+Display a remote image into the terminal.
+
+## Build
+
+Install Go Lang from: https://go.dev/
+
+Then build
+
+With make
+```
+make
+```
+
+Or directly
+```
+go build -o imgcat
+```
+
+## Usage
+
+```
+./imgcat -url "https://images.pexels.com/photos/2558605/pexels-photo-2558605.jpeg?cs=srgb&dl=pexels-anel-rossouw-2558605.jpg&fm=jpg" -height 25
+```
+
+<img width="1069" alt="Capture d’écran 2021-12-11 à 17 40 55" src="https://user-images.githubusercontent.com/65178/145684510-39617c22-5818-4573-896c-7e0e6915db91.png">
+
+## Help
+
+```
+# imgcat -h
+Usage of imgcat:
+  -height int
+    	maximum height in lines
+  -url string
+    	url of the jpg
+```