doc: help message and README added

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+# Dsco
+
+A simple ppm image processor, that use convolution to transform images
+
+## Usage
+
+If `INPUT` is not specified the program will use standard input.
+
+```
+Usage:
+    dsco [INPUT] -f [edge|blur|sharpen] [-o OUTPUT]
+
+Options:
+    -o      output file [default: /dev/stdout] 
+    -f      filter to use
+
+            edge:       -1 -1 -1
+                        -1  8 -1
+                        -1 -1 -1
+
+            sharpen:     0 -1  0
+                        -1  5 -1
+                         0 -1  0
+
+            blur:        1  2  1
+                   1/16  2  4  2
+                         1  2  1
+```