Add README

Author: Syllo

README.markdown

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+NVTOP
+=====
+
+What is NVTOP?
+--------------
+
+Nvtop stands for NVidia TOP, a (h)top like task monitor for NVIDIA GPUs. It can
+handle multiple GPUs and print information about them in a htop familiar way.
+
+Because a picture is worth a thousand words:
+
+![NVTOP interface](/screenshot/NVTOP_ex1.png)
+
+Dependencies
+------------
+
+Three libraries are required:
+
+* The NVIDIA Management Library (NVML).
+  * This queries the GPU for information.
+* The ncurses library driving the user interface.
+  * This drives the screen.
+
+Limitations
+-----------
+
+The NVML library does not support some of the queries for GPUs coming before the
+Kepler microarchitecture. Anything starting at GeForce 600, GeForce 800M and
+successor should work fine. For more information about supported GPUs please
+take a look at the [NVML documentation](http://docs.nvidia.com/deploy/nvml-api/nvml-api-reference.html#nvml-api-reference).
+
+Build
+-----
+
+CMAKE is used as build manager.
+
+To build the binary on Linux:
+
+```bash
+mkdir build && cd build
+cmake ..
+make
+make install # You may need sufficent permission for that (root)
+```
+
+The build system support multiple build type (-DCMAKE_BUILD_TYPE):
+
+* Release: Binary without debug information
+* RelWithDebInfo: Binary with debug information
+* Debug: Compile warning flags and address/undefined sanitizer (For development only)
+* Optimized: Build with architecture specific optimisations (May be not portable across machines with different processor)
+
+Build Options
+-------------
+
+None for the moment.
+
+License
+-------
+
+Nvtop is licensed under the GPLV3 licence or any later version.
+You will find a copy of the license inside the COPYING file of the repository or
+at the gnu website <[www.gnu.org/licenses/](http://www.gnu.org/licenses/)>.