Update Readme

[stas-at-ibm]

Description

• add guide how to run tests
• create Troubleshooting docs, add "MongoDB BulkWriteError" and solution (Set the connection string correctly i.e. /game-stats?retryWrites=...)

Resources

Mongo Error
ERROR [27-10-2023 10:23:51]: No write concern mode named 'majority/game-stats' found in replica set configuration
Oct 27 12:24:07 PM      err: {
Oct 27 12:24:07 PM        "type": "MongoBulkWriteError",
Oct 27 12:24:07 PM        "message": "No write concern mode named 'majority/game-stats' found in replica set configuration",
Oct 27 12:24:07 PM        "stack":
Oct 27 12:24:07 PM            MongoBulkWriteError: No write concern mode named 'majority/game-stats' found in replica set configuration
Oct 27 12:24:07 PM                at handleMongoWriteConcernError (/app/steam-game-stats/node_modules/mongodb/lib/bulk/common.js:456:14)
Oct 27 12:24:07 PM                at resultHandler (/app/steam-game-stats/node_modules/mongodb/lib/bulk/common.js:393:20)
Oct 27 12:24:07 PM                at /app/steam-game-stats/node_modules/mongodb/lib/utils.js:413:17
Oct 27 12:24:07 PM                at /app/steam-game-stats/node_modules/mongodb/lib/operations/execute_operation.js:57:17
Oct 27 12:24:07 PM                at retryOperation (/app/steam-game-stats/node_modules/mongodb/lib/operations/execute_operation.js:106:20)
Oct 27 12:24:07 PM                at /app/steam-game-stats/node_modules/mongodb/lib/operations/execute_operation.js:157:32
Oct 27 12:24:07 PM                at /app/steam-game-stats/node_modules/mongodb/lib/cmap/connection_pool.js:270:25
Oct 27 12:24:07 PM                at handleOperationResult (/app/steam-game-stats/node_modules/mongodb/lib/sdam/server.js:385:16)
Oct 27 12:24:07 PM                at Connection.onMessage (/app/steam-game-stats/node_modules/mongodb/lib/cmap/connection.js:199:21)
Oct 27 12:24:07 PM                at MessageStream.<anonymous> (/app/steam-game-stats/node_modules/mongodb/lib/cmap/connection.js:63:60)
Oct 27 12:24:07 PM        "writeErrors": [],
Oct 27 12:24:07 PM        "result": {
Oct 27 12:24:07 PM          "ok": 1,
Oct 27 12:24:07 PM          "writeErrors": [],
Oct 27 12:24:07 PM          "writeConcernErrors": [
Oct 27 12:24:07 PM            {
Oct 27 12:24:07 PM              "code": 79,
Oct 27 12:24:07 PM              "codeName": "UnknownReplWriteConcern",
Oct 27 12:24:07 PM              "errmsg": "No write concern mode named 'majority/game-stats' found in replica set configuration",
Oct 27 12:24:07 PM              "errInfo": {
Oct 27 12:24:07 PM                "writeConcern": {
Oct 27 12:24:07 PM                  "w": "majority/game-stats",
Oct 27 12:24:07 PM                  "wtimeout": 0,
Oct 27 12:24:07 PM                  "provenance": "clientSupplied"
Oct 27 12:24:07 PM                }
Oct 27 12:24:07 PM              }
Oct 27 12:24:07 PM            }
Oct 27 12:24:07 PM          ],