Question: Otto Addo is currently the assistant manager of a German football club founded in what year?

Context paragraphs:
Otto Addo: Otto Addo (born 9 June 1975 in Hamburg, West Germany) is a scout and manager, and a retired Ghanaian-German footballer who played for Ghana internationally.  He is currently the assistant manager of Borussia Mönchengladbach.

Red Star F.C.: Red Star Football Club, also known simply as Red Star (] ), is a French association football club founded in Paris in 1897.  The club currently play in the Championnat National.  As of 2016, Red Star plays its home matches at the Stade Jean-Bouin as their traditional home, Stade Bauer in Saint-Ouen does not meet the necessary requirements of a French second tier stadium.  The team is managed by former Sporting Braga assistant coach and captained by Lloyd Palun.

Georges Tournay: Georges Tournay (born 6 October 1960) is a French former professional footballer who is currently the manager of Championnat National side US Boulogne.  During his career he played as a forward for Cambrai, Lens, Abbeville and Louhans-Cuiseaux and made over 200 league appearances in total.  After retiring in 1992 he became manager of the Lens C team and was then named reserve team coach two years later.  Between 1999 and 2005, Tournay was the assistant manager at Lens, and had a four-month spell in charge of the first team between February 2001 and June 2001.  He later worked as the head of youth development at the club before returning to the assistant manager post under László Bölöni in January 2011.

Borussia Mönchengladbach: Borussia VfL 1900 Mönchengladbach e.V., commonly known as Borussia Mönchengladbach (] ), Mönchengladbach or Gladbach, is a German football club in Mönchengladbach, North Rhine-Westphalia.  Founded in 1900, Borussia Mönchengladbach play in the Bundesliga, the top tier of the German football league system, making their first appearance in the league during the 1965–66 season.  Subsequently, the club became one of Germany's best-known, best-supported, and most successful teams, winning the Bundesliga five times during the 1970s.

Roy Keane: Roy Maurice Keane (born 10 August 1971) is an Irish football assistant manager and former professional football player.  He is the joint-most successful Irish footballer of all time, having won 19 major trophies, 17 of which came at Manchester United, in his club career.  He is currently the assistant manager of the Republic of Ireland national football team.

2011–12 Watford F.C. season: Watford Football Club (also known simply as Watford, or as The Hornets) is an English football club from Watford, Hertfordshire.  The team competed in the Football League Championship in 2011–12, their fifth consecutive season in the second tier of English football since their relegation from the Premier League in 2006–07.  The 2011–12 season consisted of pre-season friendlies in July 2011, followed by competitive matches in the Football League, FA Cup and Football League Cup between August 2011 and April 2012.  Assistant manager Sean Dyche became manager in July 2011, following the departure of Malky Mackay.  The club's captain for the season was central midfielder John Eustace.  Watford's chairman was Graham Taylor, who previously took Watford from the Fourth Division to the First Division as manager.

SSV Jahn Regensburg: Sport- und Schwimmverein Jahn Regensburg e. V., commonly known as SSV Jahn Regensburg, Jahn Regensburg, SSV Jahn or simply Jahn is a German football club based in Regensburg, Bavaria.  The club is based on a gymnastics club founded in 1886 as "Turnerbund Jahn Regensburg" which took its name from Friedrich Ludwig Jahn, whose ideas of gymnastics greatly influenced German sport in the 19th century.  The football department was created in 1907.

Orangefield Old Boys' Association F.C.: Orangefield Old Boys' Association Football Club (or Orangefield OB) is a Northern Irish, intermediate football club playing in Division 1A of the Northern Amateur Football League.  The club formed in 1966 and included past members and teachers of Orangefield High School.  The club joined the Amateur League in 1970, achieving intermediate status in 1987.  They currently play their home matches at the Cregagh Sports Club on Gibson Park Avenue, Belfast.  The first team is managed by Gary Cunningham with Stephen Carlisle serving as assistant manager.  Orangefield OB field six teams in total.  As well as the first team, there is a second team playing in NAFL Division 3B, a development team playing in Div 4 of BBOB league and junior teams for the Under 16's, Under 15's and Under 14's.

Yarraville Football Club: Yarraville Football Club was an Australian rules football club founded in 1903 and played in the VJFA until 1927.  In 1928, the club joined the Victorian Football Association where it played until 1984 when the club went into recess.  In 1996, the Kingsville Football Club in the Western Region Football League who by this time had taken over the Yarraville ground changed their name to Yarraville.  In 2007 the Yarraville Football Club merged with the Seddon Football Club to become the Yarraville Seddon Eagles.

AS Strasbourg: Association Sportive de Strasbourg is a French football club from the city of Strasbourg in the Alsace region of France.  It was formed in 1920 by the union of FV Straßburg, a German club founded in 1890 when the city was part of the German Empire, and Strasbourger FC Donar, founded in 1899.  The team has played in both French and German football leagues, as the political fortunes of the region have changed.

Supporting paragraphs: Otto Addo Borussia Mönchengladbach
Answer: 1900