Added Readme.md and updated .gitignore accordingly

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Readme.md

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+# Purpose, Description
+
+This is the Modular ocean model (MOM5) component of the IOW ESM.
+The starting point for the IOW ESM development was a IOW-adapted version of the code that is originating from
+the following commit on https://github.com/mom-ocean/MOM5
+
+Autor:			Nicholas Hannah <nicholash@users.noreply.github.com>
+Datum:			vor 7 Jahren (24.03.2014 04:17:14)
+Commit Hash:	f406b4c5b4bbece3b0ae7f376a4ba90ea68ffb1e
+Kind:			Commit Index
+
+Merge pull request #33 from nicholash/mom-87-various-bugs
+
+Mom 87 various bugs
+
+Please refer to https://mom-ocean.github.io/docs/userguide/ for more information.
+
+
+# Authors
+
+* SK      (sven.karsten@io-warnemuende.de)
+* HR      (hagen.radtke@io-warnemuende.de)
+
+
+# Versions
+
+## 1.01.00 (latest release)
+
+| date        | author(s)   | link      |
+|---          |---          |---        |
+| 2022-12-22  | SK          | [1.01.00](https://git.io-warnemuende.de/iow_esm/components.mom5/src/branch/1.01.00)  |  
+
+<details> 
+
+### changes
+* updated ERGOM module to newest available version
+  * Caution: this code is not compatible with current 8nm example setups!
+  * 8nm examples have to be updated as well
+* build with compiler flags that lead to more stablility (not so many NaN problems)
+
+### dependencies
+* OASIS3-MCT libraries
+* see build scripts for more dependencies  
+
+### known issues
+* in coupled model this version leads to too cold winter temperatures 
+  when evaluated from 1979-2009
+* model is not running on phy-2
+
+### tested with
+* intensively tested on both HLRN machines
+  * using example setups available under:
+    (coupled) /scratch/usr/mviowmod/IOW_ESM/setups/
+              MOM5_Baltic-CCLM_Eurocordex/example_3nm_0.22deg/1.00.00
+    (uncoupled) /scratch/usr/mviowmod/IOW_ESM/setups/
+                MOM5_Baltic/example_3nm/1.00.00
+   * results exhibit known issues
+  * can be built and run on Haumea but output is not intensively tested
+
+
+## 1.00.00 
+
+| date        | author(s)   | link      |
+|---          |---          |---        |
+| 2022-01-28  | SK, HR      | [1.00.00](https://git.io-warnemuende.de/iow_esm/components.mom5/src/branch/1.00.00)  |  
+
+<details> 
+
+### changes
+* initial release
+* main codes is based on branch 5.1.0 on https://github.com/mom-ocean/MOM5.git 
+* coupling interface has been implemented by authors
+* adapted Fopts and added build scripts for 
+  * both HLRN supercomputers
+  * Rostock University's cluster Haumea
+  * for IOW phy-2 machine (model is not running here)
+* added OASIS interface to flux calculator
+  * send SST, fraction of ice and albedo
+  * send variables to calculate fluxes for evaporation, latent and sensible heat,
+    momentum 
+  * receive radiation and precipitation
+  * receive calculated fluxes in corresponding variables that have been fed by forcing data in the uncoupled mode
+* executable can run in coupled model or as stand alone
+  * use parameter `type_atmos='flux_calculator'` in `coupler_nml` in `input.nml` for control, see also documentation in
+      iow_esm/main project
+
+### dependencies
+* OASIS3-MCT libraries
+* see build scripts for more dependencies  
+
+### known issues
+* in coupled model this version leads to too cold winter temperatures 
+  when evaluated from 1979-2009
+* model is not running on phy-2
+
+### tested with
+* intensively tested on both HLRN machines
+  * using example setups available under:
+    (coupled) /scratch/usr/mviowmod/IOW_ESM/setups/
+              MOM5_Baltic-CCLM_Eurocordex/example_8nm_0.22deg/1.00.00
+    (uncoupled) /scratch/usr/mviowmod/IOW_ESM/setups/
+                MOM5_Batlic/example_8nm/1.00.00
+   * results exhibit known issues
+  * can be built and run on Haumea but output is not intensively tested