[add] readme

readme.md

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+# html-docwrap
+
+reads an HTML string from `stdin`, wraps it into an HTML document with styling and prints the result to `stdout`
+
+
+## Building
+
+### Requirements
+
+- shell interpreter
+
+
+### Instructions
+
+- execute `tools/build`
+
+
+## Installation
+
+### Requirements
+
+- shell interpreter
+
+
+### Instructions
+
+- as `root`, execute `tools/install`
+
+
+## Usage
+
+### Requirements
+
+- Python3 intpreter
+
+
+### Instructions
+
+- see `html-docwrap -h`
+- example: `echo "<strong>Hello, World!</strong>" | html-docwrap`
+